Benoni時間からDerry時間への変換
21:09:25
-1
20:09:25
+7
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+3.5
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+3.5
+3
+3
+2.5
+2
+1.5
+1
+1
+1
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+0
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-1
-1
-1
-1
-1
-1
-2
-5
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-9