513. Rectangle 4X3: Remove 4 to create 8 squares

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There are 20 squares in total in the layout above:

2 of size 3X3 (ADUR and BEVS)
6 of size 2X2 (ACNK, BDOM, CEPN, FHTR, GJUS and HLVT)
12 of size 1X1

Take away 4 matchsticks to leave only 8 squares all equal in size.

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