Fix extract big data.

Normand Briere

2019-07-14 bc829f47837b5a001f911542140b0b8e63c2bb0c

 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)