Materials working.

Normand Briere

2019-08-06 4ec7130da08861dc4aff0232dbce38f3471696a4

 Checker.java
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@@ -2,7 +2,7 @@
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 {
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     Checker()
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     {
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-        this("Checker");
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+        this("Overlay");
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     }
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     Checker(String name)