In other words, I like it to work like in the following example:
Line:
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(map2D + '((1 . 2) (3 . 4) (5 . 6)) )
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(3 7 11)
1 + 2 = 3, or equivalently:
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(+ 1 2) == 3
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(+ 3 4) == 7
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(+ 5 6) == 11