| Who Cites nth tl? | |
| nth_tl |   0  as else nth_tl(n-1;tl(as)) fi  (recursive) | 
|  A:Type, as:A List, i:  . nth_tl(i;as)  A List | |
| tl |  nil ; h.t  t | 
|  A:Type, l:A List. tl(l)  A List | |
| le_int |   j ==   j<  i | 
|  i,j:  . (i   j)    | |
| lt_int |  j == if i<j  true  ; false  fi | 
|  i,j:  . (i<  j)    | |
| bnot |   b == if b  false  else true  fi | 
|  b:  .   b    | 
| Syntax: | has structure: | 
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