C1111233131211111211113313331333133313331313221131211113313223133112121   >>    C111123313121111121111331333133313331333131322113121111331322313311212   <<    C1111233131211111211113313331333133313331313221131211113313223133112123   >>      C1111233131211111211113313331333133313331313221131211113313223133112122   >>