isay-sosa / WolfSheepStraw

Once upon a time a farmer went to market and purchased a wolf, a sheep, and straw. On his way home, the farmer came to the bank of a river and rented a boat. But in crossing the river by boat, the farmer could carry only himself and a single one of his purchases - the wolf, the sheep, or the straw. If left together, the wolf would eat the sheep, or the sheep would eat the straw. The farmer's challenge was to carry himself and his purchases to the far bank of the river, leaving each purchase intact. How did he do it?