Water machine puzzle

Solve the following problem and remember your thought processes.

Bobbiy wanted to make a water machine. The diagram below shows how s/he took a container, put four holes in the side, a funnel on top, and connected a pipe to the funnel. Bobbiy wants to connect plastic tubes from the pipe to the holes so that when water is poured into the funnel it will/won't come out of none/some/all of the holes. Bobbiy wants to know all of the possible combinations that could be made before deciding. What are they?










Dr. Robert Sweetland's notes