C1111233131211111211113313331333133313331313221131211113313232122221   >>    C111123313121111121111331333133313331333131322113121111331323212222   <<    C1111233131211111211113313331333133313331313221131211113313232122223   >>      C1111233131211111211113313331333133313331313221131211113313232122222   >>