C11111211113313112113313331333131211113313331311211331333133313331333132211121   >>    C1111121111331311211331333133313121111331333131121133133313331333133313221112   <<    C11111211113313112113313331333131211113313331311211331333133313331333132211123   >>      C11111211113313112113313331333131211113313331311211331333133313331333132211122   >>