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rev-acco is the standard tail-recursive reverse with an accumulator; rev-2o starts the accumulator at the empty list. Faster than the appendo-driven reverseo for forward queries because there is no nested appendo per element. Trade-off: rev-acco is asymmetric. The accumulator's initial-empty cannot be enumerated backwards the way reverseo does, so reverseo is still the right choice when both directions matter. A test verifies rev-2o and reverseo agree on forward queries. 6 new tests, 422/422 cumulative.