Have you heard the one about an itinerant entertainer traveling with a wolf, a goat, and a basket of cabbages?
The showman comes to a river and finds a small boat that holds only himself and one passenger. For obvious reasons, he can’t leave the wolf alone with the goat, or the goat with the cabbages. How does he get his cargo safely to the other side?
The showman would need seven trips to ferry the cabbages, goat, and wolf across the river.