giles
f4ab7f2534
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reverseo: standard recursive definition via appendo. Forward works in run*; backward (input fresh, output ground) works in run 1 but run* diverges trying to enumerate the unique answer (canonical TRS issue with naive reverseo). lengtho: Peano encoding (:z / (:s :z) / (:s (:s :z)) ...) so it works relationally in both directions without arithmetic-as-relation. Forward returns the Peano length; backward enumerates lists of a given length. 162/162 cumulative.