At: member col subst2 2 2 3 1 2
1. c: Label
Collection(Term)
2. r: rel()
3. r': rel()
4. as: (Label
Term) List
5. 1of(unzip(as)) = rel_primed_vars(r)
6. 
i:
. i < ||as|| 
2of(as[i]) 
c(1of(as[i]))
7. r' = rel_subst2(as;r)
8. i:
9. i < ||2of(unzip(as))||
1of(unzip(as))[i] = 1of(as[i])
By:
MoveToConcl -1
THEN
Unfold `unzip` 0
THEN
Reduce 0
THEN
RWW "map_select" 0
THEN
Reduce 0
THEN
RWW "map_length_nat" -1
Generated subgoals:None
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