diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 1144cab..e898004 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -4,12 +4,10 @@
     <option name="ANALYZE_TEST_SOURCES" value="false" />
   </component>
   <component name="ChangeListManager">
-    <list default="true" id="65f95bb6-3a86-4ed6-841e-441936291ad4" name="Default" comment="Refactor largest Spot">
+    <list default="true" id="65f95bb6-3a86-4ed6-841e-441936291ad4" name="Default" comment="Implement Table.getSpotIndexByPosition">
       <change type="MODIFICATION" beforePath="$PROJECT_DIR$/.idea/workspace.xml" afterPath="$PROJECT_DIR$/.idea/workspace.xml" />
-      <change type="MODIFICATION" beforePath="$PROJECT_DIR$/src/Coffee/Spot.php" afterPath="$PROJECT_DIR$/src/Coffee/Spot.php" />
+      <change type="MODIFICATION" beforePath="$PROJECT_DIR$/index.php" afterPath="$PROJECT_DIR$/index.php" />
       <change type="MODIFICATION" beforePath="$PROJECT_DIR$/src/Coffee/Table.php" afterPath="$PROJECT_DIR$/src/Coffee/Table.php" />
-      <change type="MODIFICATION" beforePath="$PROJECT_DIR$/tests/Coffee/PositionTest.php" afterPath="$PROJECT_DIR$/tests/Coffee/PositionTest.php" />
-      <change type="MODIFICATION" beforePath="$PROJECT_DIR$/tests/Coffee/TableTest.php" afterPath="$PROJECT_DIR$/tests/Coffee/TableTest.php" />
     </list>
     <ignored path="coffeetable.iws" />
     <ignored path=".idea/workspace.xml" />
@@ -38,8 +36,8 @@
       <file leaf-file-name="index.php" pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/index.php">
           <provider selected="true" editor-type-id="text-editor">
-            <state vertical-scroll-proportion="-10.666667">
-              <caret line="16" column="48" selection-start-line="16" selection-start-column="48" selection-end-line="16" selection-end-column="48" />
+            <state vertical-scroll-proportion="-12.666667">
+              <caret line="19" column="51" selection-start-line="19" selection-start-column="51" selection-end-line="19" selection-end-column="51" />
               <folding />
             </state>
           </provider>
@@ -48,8 +46,8 @@
       <file leaf-file-name="Table.php" pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/src/Coffee/Table.php">
           <provider selected="true" editor-type-id="text-editor">
-            <state vertical-scroll-proportion="-39.333332">
-              <caret line="59" column="5" selection-start-line="59" selection-start-column="5" selection-end-line="59" selection-end-column="5" />
+            <state vertical-scroll-proportion="-46.333332">
+              <caret line="74" column="41" selection-start-line="74" selection-start-column="41" selection-end-line="74" selection-end-column="41" />
               <folding />
             </state>
           </provider>
@@ -58,8 +56,8 @@
       <file leaf-file-name="TableTest.php" pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/tests/Coffee/TableTest.php">
           <provider selected="true" editor-type-id="text-editor">
-            <state vertical-scroll-proportion="-3.402439">
-              <caret line="116" column="66" selection-start-line="116" selection-start-column="66" selection-end-line="116" selection-end-column="66" />
+            <state vertical-scroll-proportion="-21.037037">
+              <caret line="111" column="28" selection-start-line="111" selection-start-column="28" selection-end-line="111" selection-end-column="28" />
               <folding />
             </state>
           </provider>
@@ -78,7 +76,7 @@
       <file leaf-file-name="SpotTest.php" pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/tests/Coffee/SpotTest.php">
           <provider selected="true" editor-type-id="text-editor">
-            <state vertical-scroll-proportion="0.0">
+            <state vertical-scroll-proportion="-16.666666">
               <caret line="25" column="0" selection-start-line="25" selection-start-column="0" selection-end-line="25" selection-end-column="0" />
               <folding />
             </state>
@@ -88,7 +86,7 @@
       <file leaf-file-name="Position.php" pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/src/Coffee/Position.php">
           <provider selected="true" editor-type-id="text-editor">
-            <state vertical-scroll-proportion="-102.51852">
+            <state vertical-scroll-proportion="-90.51852">
               <caret line="175" column="23" selection-start-line="175" selection-start-column="23" selection-end-line="175" selection-end-column="23" />
               <folding />
             </state>
@@ -105,10 +103,10 @@
           </provider>
         </entry>
       </file>
-      <file leaf-file-name="Tile.php" pinned="false" current-in-tab="false">
+      <file leaf-file-name="Tile.php" pinned="false" current-in-tab="true">
         <entry file="file://$PROJECT_DIR$/src/Coffee/Tile.php">
           <provider selected="true" editor-type-id="text-editor">
-            <state vertical-scroll-proportion="0.0">
+            <state vertical-scroll-proportion="2.2090163">
               <caret line="72" column="20" selection-start-line="72" selection-start-column="20" selection-end-line="72" selection-end-column="20" />
               <folding />
             </state>
@@ -125,10 +123,10 @@
           </provider>
         </entry>
       </file>
-      <file leaf-file-name="PositionTest.php" pinned="false" current-in-tab="true">
+      <file leaf-file-name="PositionTest.php" pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/tests/Coffee/PositionTest.php">
           <provider selected="true" editor-type-id="text-editor">
-            <state vertical-scroll-proportion="-1.8636364">
+            <state vertical-scroll-proportion="-1.2592592">
               <caret line="21" column="37" selection-start-line="21" selection-start-column="37" selection-end-line="21" selection-end-column="37" />
               <folding />
             </state>
@@ -185,11 +183,11 @@
         <option value="$PROJECT_DIR$/tests/Coffee/OutputTest.php" />
         <option value="$PROJECT_DIR$/src/Coffee/Map.php" />
         <option value="$PROJECT_DIR$/tests/Coffee/SpotTest.php" />
-        <option value="$PROJECT_DIR$/index.php" />
         <option value="$PROJECT_DIR$/src/Coffee/Spot.php" />
-        <option value="$PROJECT_DIR$/src/Coffee/Table.php" />
-        <option value="$PROJECT_DIR$/tests/Coffee/TableTest.php" />
         <option value="$PROJECT_DIR$/tests/Coffee/PositionTest.php" />
+        <option value="$PROJECT_DIR$/tests/Coffee/TableTest.php" />
+        <option value="$PROJECT_DIR$/src/Coffee/Table.php" />
+        <option value="$PROJECT_DIR$/index.php" />
       </list>
     </option>
   </component>
@@ -483,7 +481,7 @@
       <recent name="$PROJECT_DIR$/Tests" />
     </key>
   </component>
-  <component name="RunManager" selected="PHPUnit.Tests">
+  <component name="RunManager" selected="PHP Script.index.php">
     <configuration default="false" name="index.php" type="PhpLocalRunConfigurationType" factoryName="PHP Console" temporary="true" path="$PROJECT_DIR$/index.php">
       <method />
     </configuration>
@@ -753,47 +751,68 @@
       <option name="project" value="LOCAL" />
       <updated>1458499267612</updated>
     </task>
-    <option name="localTasksCounter" value="36" />
+    <task id="LOCAL-00036" summary="Refactor largest Spot and its size">
+      <created>1458499688945</created>
+      <option name="number" value="00036" />
+      <option name="project" value="LOCAL" />
+      <updated>1458499688945</updated>
+    </task>
+    <task id="LOCAL-00037" summary="Implement Table.getSpotIndexByPosition">
+      <created>1458500376151</created>
+      <option name="number" value="00037" />
+      <option name="project" value="LOCAL" />
+      <updated>1458500376151</updated>
+    </task>
+    <option name="localTasksCounter" value="38" />
     <servers />
   </component>
   <component name="TestHistory">
-    <history-entry file="Tests - 2016.03.20 at 19h 27m 31s.xml">
+    <history-entry file="Tests - 2016.03.20 at 19h 36m 47s.xml">
       <configuration name="Tests" configurationId="PHPUnitRunConfigurationType" />
     </history-entry>
-    <history-entry file="Tests - 2016.03.20 at 19h 28m 04s.xml">
+    <history-entry file="Tests - 2016.03.20 at 19h 37m 45s.xml">
       <configuration name="Tests" configurationId="PHPUnitRunConfigurationType" />
     </history-entry>
-    <history-entry file="Tests - 2016.03.20 at 19h 30m 16s.xml">
+    <history-entry file="Tests - 2016.03.20 at 19h 42m 31s.xml">
       <configuration name="Tests" configurationId="PHPUnitRunConfigurationType" />
     </history-entry>
-    <history-entry file="Tests - 2016.03.20 at 19h 36m 41s.xml">
+    <history-entry file="Tests - 2016.03.20 at 19h 45m 45s.xml">
       <configuration name="Tests" configurationId="PHPUnitRunConfigurationType" />
     </history-entry>
-    <history-entry file="Tests - 2016.03.20 at 19h 36m 47s.xml">
+    <history-entry file="Tests - 2016.03.20 at 19h 47m 05s.xml">
       <configuration name="Tests" configurationId="PHPUnitRunConfigurationType" />
     </history-entry>
-    <history-entry file="Tests - 2016.03.20 at 19h 37m 45s.xml">
+    <history-entry file="Tests - 2016.03.20 at 19h 47m 37s.xml">
       <configuration name="Tests" configurationId="PHPUnitRunConfigurationType" />
     </history-entry>
-    <history-entry file="Tests - 2016.03.20 at 19h 42m 31s.xml">
+    <history-entry file="Tests - 2016.03.20 at 19h 48m 32s.xml">
       <configuration name="Tests" configurationId="PHPUnitRunConfigurationType" />
     </history-entry>
-    <history-entry file="Tests - 2016.03.20 at 19h 45m 45s.xml">
+    <history-entry file="Tests - 2016.03.20 at 19h 56m 06s.xml">
       <configuration name="Tests" configurationId="PHPUnitRunConfigurationType" />
     </history-entry>
-    <history-entry file="Tests - 2016.03.20 at 19h 47m 05s.xml">
+    <history-entry file="Tests - 2016.03.20 at 19h 56m 46s.xml">
       <configuration name="Tests" configurationId="PHPUnitRunConfigurationType" />
     </history-entry>
-    <history-entry file="Tests - 2016.03.20 at 19h 47m 37s.xml">
+    <history-entry file="Tests - 2016.03.20 at 19h 58m 56s.xml">
       <configuration name="Tests" configurationId="PHPUnitRunConfigurationType" />
     </history-entry>
   </component>
+  <component name="TodoView" selected-index="4">
+    <todo-panel id="selected-file">
+      <is-autoscroll-to-source value="true" />
+    </todo-panel>
+    <todo-panel id="all">
+      <are-packages-shown value="true" />
+      <is-autoscroll-to-source value="true" />
+    </todo-panel>
+  </component>
   <component name="ToolWindowManager">
     <frame x="-2" y="0" width="1444" height="899" extended-state="0" />
-    <editor active="true" />
+    <editor active="false" />
     <layout>
-      <window_info id="Project" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="true" show_stripe_button="true" weight="0.23333333" sideWeight="0.5" order="0" side_tool="false" content_ui="tabs" />
-      <window_info id="TODO" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="6" side_tool="false" content_ui="tabs" />
+      <window_info id="Project" active="true" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="true" show_stripe_button="true" weight="0.23333333" sideWeight="0.5" order="0" side_tool="false" content_ui="tabs" />
+      <window_info id="TODO" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.32917705" sideWeight="0.5" order="6" side_tool="false" content_ui="tabs" />
       <window_info id="Messages" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.32917705" sideWeight="0.5" order="7" side_tool="false" content_ui="tabs" />
       <window_info id="Event Log" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="12" side_tool="true" content_ui="tabs" />
       <window_info id="Database" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="3" side_tool="false" content_ui="tabs" />
@@ -803,7 +822,7 @@
       <window_info id="Structure" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.24964234" sideWeight="0.5" order="1" side_tool="false" content_ui="tabs" />
       <window_info id="Terminal" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="10" side_tool="false" content_ui="tabs" />
       <window_info id="Favorites" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="2" side_tool="true" content_ui="tabs" />
-      <window_info id="Debug" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.3241895" sideWeight="0.5" order="3" side_tool="false" content_ui="tabs" />
+      <window_info id="Debug" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="true" show_stripe_button="true" weight="0.3241895" sideWeight="0.5" order="3" side_tool="false" content_ui="tabs" />
       <window_info id="Cvs" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.25" sideWeight="0.5" order="4" side_tool="false" content_ui="tabs" />
       <window_info id="Message" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="0" side_tool="false" content_ui="tabs" />
       <window_info id="PHP-CGI Server" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="9" side_tool="false" content_ui="tabs" />
@@ -829,9 +848,8 @@
     <option name="myLimit" value="2678400000" />
   </component>
   <component name="VcsManagerConfiguration">
+    <option name="CHECK_NEW_TODO" value="false" />
     <option name="USE_COMMIT_MESSAGE_MARGIN" value="true" />
-    <MESSAGE value="Refactor Tile constructor to accept parameters&#10;" />
-    <MESSAGE value="Refactor Table constructor to accept arguments" />
     <MESSAGE value="Implement Map.isValidPosition" />
     <MESSAGE value="Implement Map.isVisitedPosition" />
     <MESSAGE value="Rename Tile to Position" />
@@ -855,7 +873,9 @@
     <MESSAGE value="Implement recursive algorithm to find Spots" />
     <MESSAGE value="Implement Spot size" />
     <MESSAGE value="Refactor largest Spot" />
-    <option name="LAST_COMMIT_MESSAGE" value="Refactor largest Spot" />
+    <MESSAGE value="Refactor largest Spot and its size" />
+    <MESSAGE value="Implement Table.getSpotIndexByPosition" />
+    <option name="LAST_COMMIT_MESSAGE" value="Implement Table.getSpotIndexByPosition" />
     <option name="OPTIMIZE_IMPORTS_BEFORE_PROJECT_COMMIT" value="true" />
     <option name="REFORMAT_BEFORE_PROJECT_COMMIT" value="true" />
     <option name="REARRANGE_BEFORE_PROJECT_COMMIT" value="true" />
@@ -868,11 +888,16 @@
           <line>107</line>
           <option name="timeStamp" value="40" />
         </line-breakpoint>
+        <line-breakpoint enabled="true" type="php">
+          <url>file://$PROJECT_DIR$/index.php</url>
+          <line>19</line>
+          <option name="timeStamp" value="43" />
+        </line-breakpoint>
       </breakpoints>
       <breakpoints-dialog>
         <breakpoints-dialog />
       </breakpoints-dialog>
-      <option name="time" value="42" />
+      <option name="time" value="44" />
     </breakpoint-manager>
     <watches-manager>
       <configuration name="PhpLocalRunConfigurationType">
@@ -1189,14 +1214,6 @@
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/Coffee/Tile.php">
-      <provider selected="true" editor-type-id="text-editor">
-        <state vertical-scroll-proportion="0.0">
-          <caret line="72" column="20" selection-start-line="72" selection-start-column="20" selection-end-line="72" selection-end-column="20" />
-          <folding />
-        </state>
-      </provider>
-    </entry>
     <entry file="file://$PROJECT_DIR$/tests/Coffee/TileTest.php">
       <provider selected="true" editor-type-id="text-editor">
         <state vertical-scroll-proportion="0.0">
@@ -1205,26 +1222,26 @@
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/tests/Coffee/SpotTest.php">
+    <entry file="phar:///usr/share/webapps/bin/phpunit.phar/phpunit/Framework/TestCase.php">
       <provider selected="true" editor-type-id="text-editor">
-        <state vertical-scroll-proportion="0.0">
-          <caret line="25" column="0" selection-start-line="25" selection-start-column="0" selection-end-line="25" selection-end-column="0" />
+        <state vertical-scroll-proportion="0.31893003">
+          <caret line="985" column="0" selection-start-line="985" selection-start-column="0" selection-end-line="985" selection-end-column="0" />
           <folding />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/index.php">
+    <entry file="file://$PROJECT_DIR$/tests/Coffee/PositionTest.php">
       <provider selected="true" editor-type-id="text-editor">
-        <state vertical-scroll-proportion="-10.666667">
-          <caret line="16" column="48" selection-start-line="16" selection-start-column="48" selection-end-line="16" selection-end-column="48" />
+        <state vertical-scroll-proportion="-1.2592592">
+          <caret line="21" column="37" selection-start-line="21" selection-start-column="37" selection-end-line="21" selection-end-column="37" />
           <folding />
         </state>
       </provider>
     </entry>
-    <entry file="phar:///usr/share/webapps/bin/phpunit.phar/phpunit/Framework/TestCase.php">
+    <entry file="file://$PROJECT_DIR$/src/Coffee/Position.php">
       <provider selected="true" editor-type-id="text-editor">
-        <state vertical-scroll-proportion="0.31893003">
-          <caret line="985" column="0" selection-start-line="985" selection-start-column="0" selection-end-line="985" selection-end-column="0" />
+        <state vertical-scroll-proportion="-90.51852">
+          <caret line="175" column="23" selection-start-line="175" selection-start-column="23" selection-end-line="175" selection-end-column="23" />
           <folding />
         </state>
       </provider>
@@ -1237,34 +1254,42 @@
         </state>
       </provider>
     </entry>
+    <entry file="file://$PROJECT_DIR$/tests/Coffee/SpotTest.php">
+      <provider selected="true" editor-type-id="text-editor">
+        <state vertical-scroll-proportion="-16.666666">
+          <caret line="25" column="0" selection-start-line="25" selection-start-column="0" selection-end-line="25" selection-end-column="0" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
     <entry file="file://$PROJECT_DIR$/tests/Coffee/TableTest.php">
       <provider selected="true" editor-type-id="text-editor">
-        <state vertical-scroll-proportion="-3.402439">
-          <caret line="116" column="66" selection-start-line="116" selection-start-column="66" selection-end-line="116" selection-end-column="66" />
+        <state vertical-scroll-proportion="-21.037037">
+          <caret line="111" column="28" selection-start-line="111" selection-start-column="28" selection-end-line="111" selection-end-column="28" />
           <folding />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/src/Coffee/Table.php">
       <provider selected="true" editor-type-id="text-editor">
-        <state vertical-scroll-proportion="-39.333332">
-          <caret line="59" column="5" selection-start-line="59" selection-start-column="5" selection-end-line="59" selection-end-column="5" />
+        <state vertical-scroll-proportion="-46.333332">
+          <caret line="74" column="41" selection-start-line="74" selection-start-column="41" selection-end-line="74" selection-end-column="41" />
           <folding />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/Coffee/Position.php">
+    <entry file="file://$PROJECT_DIR$/index.php">
       <provider selected="true" editor-type-id="text-editor">
-        <state vertical-scroll-proportion="-102.51852">
-          <caret line="175" column="23" selection-start-line="175" selection-start-column="23" selection-end-line="175" selection-end-column="23" />
+        <state vertical-scroll-proportion="-12.666667">
+          <caret line="19" column="51" selection-start-line="19" selection-start-column="51" selection-end-line="19" selection-end-column="51" />
           <folding />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/tests/Coffee/PositionTest.php">
+    <entry file="file://$PROJECT_DIR$/src/Coffee/Tile.php">
       <provider selected="true" editor-type-id="text-editor">
-        <state vertical-scroll-proportion="-1.8636364">
-          <caret line="21" column="37" selection-start-line="21" selection-start-column="37" selection-end-line="21" selection-end-column="37" />
+        <state vertical-scroll-proportion="2.2090163">
+          <caret line="72" column="20" selection-start-line="72" selection-start-column="20" selection-end-line="72" selection-end-column="20" />
           <folding />
         </state>
       </provider>
diff --git a/index.php b/index.php
index ddeb7c9..35bdc53 100644
--- a/index.php
+++ b/index.php
@@ -5,24 +5,28 @@ namespace Coffee;
 require __DIR__ . '/vendor/autoload.php';
 
 try {
-//    $map = new Map([
-//        [0, 1, 0, 1],
-//        [1, 0, 0, 0],
-//        [0, 0, 0, 1],
-//        [0, 0, 1, 1]
-//    ]);
-//
-//    $table = new Table($map);
-//
-//    $table->getSpots()[0]->getPositions()[0]->
-//
-//    foreach ($map->describedByArray() as $item) {
-//        ;
-//    }
-//
-//    $output = new Output($table);
+    $map = new Map([
+        [0, 1, 0, 1],
+        [1, 0, 0, 0],
+        [0, 0, 0, 1],
+        [0, 0, 1, 1]
+    ]);
+
+    $table = new Table($map);
+
+    echo '<table>';
+    foreach ($map->describedByArray() as $rowIndex => $row) {
+        echo '<tr>' . "\n";
+        foreach ($row as $columnIndex => $column) {
+            $position = new Position($rowIndex + 1, $columnIndex + 1);
+            echo '<td>' . $table->getSpotIndexByPosition($position) . '</td>' . "\n";
+        }
+        echo '</tr>' . "\n";
+    }
+    echo '</table>';
 
 }
 catch (\Exception $e) {
+    // TODO: provide more information, like the file:line for example
     echo 'Caught exception: ' . $e->getMessage() . "\n";
 }
diff --git a/src/Coffee/Table.php b/src/Coffee/Table.php
index 7fdcf0e..eb5ecb9 100644
--- a/src/Coffee/Table.php
+++ b/src/Coffee/Table.php
@@ -68,7 +68,7 @@ class Table {
 
     /**
      * @param Position $searchedPosition
-     * @return int|null
+     * @return int|string
      */
     public function getSpotIndexByPosition(Position $searchedPosition) {
         // Linear search
@@ -81,7 +81,7 @@ class Table {
             }
         }
 
-        return null;
+        return '';
     }
 
     /**