MP0174: Chain of Squares

There is a chain of 5 squares using 20 matchsticks.

(a) Move 4 matchsticks to make the 4 squares.
(b) Move 4 matchsticks to make the 5 squares.
(c) Move 4 matchsticks to make the 6 squares.
(d) Move 4 matchsticks to make the 7 squares.

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