# River Crossing

## Task

A farmer has five animals on one side. He needs to get all animals to the other
side of the river. Unfortunately, he only has two spaces available on his boat
and some animals cannot be left on their own. Find a series of boat crossings to
get all animals to the other side.

## Animals

* 2 Wolves  
* 1 Fox  
* 1 Chicken  
* 1 Worm

## Constraints

* Wolves eat foxes.  
* Foxes eat chickens.  
* Chickens eat worms.