C231311112223313112113313231111331323131133133313232233132212121   >>    C23131111222331311211331323111133132313113313331323223313221212   <<    C231311112223313112113313231111331323131133133313232233132212123   >>      C231311112223313112113313231111331323131133133313232233132212122   >>