C1111133313331323223313331333133313233232212111133133321123231312311   >>    C111113331333132322331333133313331323323221211113313332112323131231   <<    C1111133313331323223313331333133313233232212111133133321123231312313   >>      C1111133313331323223313331333133313233232212111133133321123231312312   >>