C131121333133313233213331333133313331333133313113313231333132213112221221   >>    C13112133313331323321333133313331333133313331311331323133313221311222122   <<    C131121333133313233213331333133313331333133313113313231333132213112221223   >>      C131121333133313233213331333133313331333133313113313231333132213112221222   >>