Conversion de l'heure de Hennenman à l'heure de Progreso de Alvaro Obregon
14:00:42
-8
06:00:42
+7
+7
+7
+7
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+6
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+1
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-1
-1
-1
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-1
-2
-5
-5
-5
-5
-6
-6
-7
-7
-8
-9