4.  On the right is shown how 6 pentominoes can be put together to make a 5 by 6 rectangle. Use the other 6 pentominoes from the full set of 12, to make another 5 by 6 rectangle. 

5.  Use the I, N, T, V, W, Y and Z pentominoes to make a 5 by 7 rectangle. Then use the other 5 pentominoes from the full set of 12, to make a 5 by 5 square. 
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