C1111233131211111211113313331333133313113313231333113313331313232321   >>    C111123313121111121111331333133313331311331323133311331333131323232   <<    C1111233131211111211113313331333133313113313231333113313331313232323   >>      C1111233131211111211113313331333133313113313231333113313331313232322   >>