C11111211113313112113313331333133313231311331333132221233132211   >>    C1111121111331311211331333133313331323131133133313222123313221   <<    C11111211113313112113313331333133313231311331333132221233132213   >>      C11111211113313112113313331333133313231311331333132221233132212   >>