C131121333133313233213331333133313331333133313231311331121222321   >>    C13112133313331323321333133313331333133313331323131133112122232   <<    C131121333133313233213331333133313331333133313231311331121222323   >>      C131121333133313233213331333133313331333133313231311331121222322   >>