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At: nd ext valcom 1 1 2 1 1 1 1 1 1 2 2 1 1 2
1. Alph: Type
2. St: Type
3. NDA: NDA(Alph;St)
4. C: (StAlph*)*
5. ||C|| > 0
6. i:(||C||-1). ||2of(C[i])|| > 0
7. q: St
8. a: Alph
9. p: St
10. NDA(C) q
11. NDA(q,a,p)
12. i:
13. 0i
14. i < ||map(c. < 1of(c),a.2of(c) > ;C)||+1-1
15. i < ||C||-1
16. i+1-||map(c. < 1of(c),a.2of(c) > ;C)|| = 0 1
17. z: 1

2of([ < p,nil > ][z]) Alph*
By: Unfold `select` 0
Generated subgoal:

1 2of(hd(nth_tl(z;[ < p,nil > ]))) Alph*

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