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`