At: add action mem 1 2 1 2 2 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. mem_f(St;s;(+f)(v))
9. mem_f(St;s;v)
u = s
mem_f(St;s;v)
(
s':St. u = s'
mem_f(St;s';v) & f(s') = s)
By: ProveProp
Generated subgoals:None
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