some or all of a wall, fence, or other means of enclosure of one hereditament forms all or part of a wall, fence, or other means of enclosure of the other hereditament
os yw rhan neu’r cyfan o wal, ffens, neu ddull arall o amgáu un hereditament yn ffurfio rhan neu’r cyfan o wal, ffens, neu ddull arall o amgáu’r hereditament arall