got info from Simon that false alarms are theoretically possible

but highly unlikely in Simian (just like in our own check)

docs/config_duplicates.html

@@ -78,7 +78,7 @@ Checkstyle plugins for duplicate code detection:
           <td>Simian</td>
           <td>Very high</td>
           <td>Low</td>
-          <td>unknown</td>
+          <td>Possible but very unlikely</td>
           <td>many languages, including Java and C/C++/C#</td>
           <td>Limited support</td>
         </tr>