C1111233131211111211113313331333133313232321333133313331333211212321   >>    C111123313121111121111331333133313331323232133313331333133321121232   <<    C1111233131211111211113313331333133313232321333133313331333211212323   >>      C1111233131211111211113313331333133313232321333133313331333211212322   >>