C131121333133313233213331333133313331333133313231333131122331211111211111231221   >>    C13112133313331323321333133313331333133313331323133313112233121111121111123122   <<    C131121333133313233213331333133313331333133313231333131122331211111211111231223   >>      C131121333133313233213331333133313331333133313231333131122331211111211111231222   >>