reduce(
t,vs. term_free_vars(t) @ vs;nil;map(t.(t)';r.args)) = reduce(t,vs. term_free_vars(t) @ vs;nil;r.args)
r:rel(). rel_free_vars((r)') = rel_free_vars(r)
| 1 | 1. r: rel() reduce(t,vs. term_free_vars(t) @ vs;nil;map(t.(t)';r.args)) = reduce(t,vs. term_free_vars(t) @ vs;nil;r.args) |
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