C11111211113313112113313331333133313231323223313113313231312211   >>    C1111121111331311211331333133313331323132322331311331323131221   <<    C11111211113313112113313331333133313231323223313113313231312213   >>      C11111211113313112113313331333133313231323223313113313231312212   >>