This is good, but can be considerably simplified:  H1 => [1, 10, 11, 20, 21],

hmm, OP has  H1-> 1,8,9

Weird question :)( i need this sequence ... imagine the equation which I won't tell you )

In reply to Re^3: How to get this not the usual round robin looping by Anonymous Monk
in thread How to get this not the usual round robin looping by fidda

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