_ _ _ _ _ _____ _____ _____ _____ _____ 
_ _ _ _ _ _____ _____ _____ _____ _____ 

Source: Original.
1. Leaving out the W and Z pentominos: _ _ _ _ _ _ _ _ _ _  _     _ _  _ __    _   _ _ _     _  __ _   _ _  _ _ _ __ __ _ __ Note that the first of these is one of only two ways to include the X pentomino (flip P and replace F with T for the other). 2. Now using W and Z, leaving out X and N: _ _ _ _ _ _ _ _ _ _ _ _ _   _ _ _  _ _ _    _    __  _ _   _ _  _ _ __ _ _ ___ _ _ _ _ _ _