Since there seems to be a slight misunderstanding, which I probably caused by an upper case letter: I meant to write
> [matrix [[a,b,15-a-b],[c,d,15-c-d]] _
> for (a,b,c,d) in cartesianProduct([1..9, 1..9, 1..9, 1..9])]
^
|
That is, I thought of cartesianProduct as a function.
Martin
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