C1111233131211111211113313331333133313331313221131211113321123122321   >>    C111123313121111121111331333133313331333131322113121111332112312232   <<    C1111233131211111211113313331333133313331313221131211113321123122323   >>      C1111233131211111211113313331333133313331313221131211113321123122322   >>