At: add  action  mem 1 2 1 2 1 1
1. St: Type
2. l: St*
3. f: St
St
4. s: St
5. u: St
6. v: St*
7. mem_f(St;s;(+f)(v)) 
 mem_f(St;s;v) 
 (
s':St. mem_f(St;s';v)  &  f(s') = s)
8. f(u) = s
 
 
s':St. u = s' 
 mem_f(St;s';v)  &  f(s') = s
By: 
InstConcl [u]
THEN
Analyze 0
Generated subgoals:| 1 |    u = u   mem_f(St;u;v) | 
| 2 |    f(u) = s | 
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