C1111233131211111211113313331333133313331313221131211113313113313232321311   >>    C111123313121111121111331333133313331333131322113121111331311331323232131   <<    C1111233131211111211113313331333133313331313221131211113313113313232321313   >>      C1111233131211111211113313331333133313331313221131211113313113313232321312   >>