C312312111133131212111133133313331333133112113313331333133313112123232211   >>    C31231211113313121211113313331333133313311211331333133313331311212323221   <<    C312312111133131212111133133313331333133112113313331333133313112123232213   >>      C312312111133131212111133133313331333133112113313331333133313112123232212   >>