C1111233131211111211113313331333133313331313221131211113313223123313111   >>    C111123313121111121111331333133313331333131322113121111331322312331311   <<    C1111233131211111211113313331333133313331313221131211113313223123313113   >>      C1111233131211111211113313331333133313331313221131211113313223123313112   >>