Re^5: How to get this not the usual round robin looping

Ah, see that is the kind of crucial detail the homework would have specified .... my version came out like :)

{
  H1 => [1, 8, 9],
  H2 => [2, 7, 10],
  H3 => [3, 6, 11],
  H4 => [4, 5, 12],
  H5 => [13, 20, 21],
}
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