C131121333133313233213331333133313331333133313231333131122112112211231311   >>    C13112133313331323321333133313331333133313331323133313112211211221123131   <<    C131121333133313233213331333133313331333133313231333131122112112211231313   >>      C131121333133313233213331333133313331333133313231333131122112112211231312   >>