Solution for #28

Alternate Solution #1

Number the connectors clockwise, with consecutive numbers: 1, 2, 3, 4, 5, 6, 7. Number the holes clockwise, with every other number, then wrapping back around: 1, 3, 5, 7, 2, 4, 6.

Alternate Solution #2

Number the connectors clockwise, with consecutive numbers: 1, 2, 3, 4, 5, 6, 7. Number the holes clockwise, skipping every other hole. The end result will be: 1, 5, 2, 6, 3, 7, 4.