C1111233131211111211113313331333133313232321333133312113313113221   >>    C111123313121111121111331333133313331323232133313331211331311322   <<    C1111233131211111211113313331333133313232321333133312113313113223   >>      C1111233131211111211113313331333133313232321333133312113313113222   >>