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java.util.ConcurrentModificationException: java.util.ConcurrentModificationException: java.util.ConcurrentModificationException: java.util.ConcurrentModificationException
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java.util.ConcurrentModificationException: 	at java.util.ArrayList.forEach(	at jp.yucchi.girlfriends_cme.GirlFriends_1.updateGirlFriend(	at jp.yucchi.girlfriends_cme.GirlFriends_CME.lambda$main$0(