C11111211113313112113313331333133313133313232233132213231312311   >>    C1111121111331311211331333133313331313331323223313221323131231   <<    C11111211113313112113313331333133313133313232233132213231312313   >>      C11111211113313112113313331333133313133313232233132213231312312   >>