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(mapo rel l1 l2) takes a 2-argument relation rel and asserts l2 is l1 with each element rel-related to its counterpart. Recursive on both lists in lockstep. Works forward (fixed l1, find l2), backward (fixed l2, find l1), or constraining mid-pipeline. Composes with intarith for arithmetic transforms: (mapo (fn (a b) (*o-i a a b)) (list 1 2 3 4) q) -> ((1 4 9 16)) 7 new tests, 300/300 cumulative.