placing 7 on the top and bottom and 6 along the sides.

Start by placing one cube on the top rotated 45 degrees. This leaves 4 open corners. You can place two cube on lets say the top open corner (Their teeny tiny corners will be on the corner, faces still touching). You can repeat this on the opposite corner. The remaining two corners can have one cube each. This adds up to 7 on the top. Repeat for the bottom.

To fill in the sides, you can place two cubes along one face, and do so for the opposite face. Similar to the top and bottom parts, you can fill in the other sides with one cube each. This puts 6 around the sides.

In total, you get 7 + 7 + 6 = 20.

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