At: lremove mem 1 2 1 2 2 1
1. St: Type
2. l: St*
3. s: St
4. eq: St
St
5. sx: St
6. u: St
7. v: St*
8. 
eq(s,sx)
9. mem_f(St;sx;v \ s) 
mem_f(St;sx;v)
10. eq(s,u)
11. u = sx 
mem_f(St;sx;v \ s)
u = sx mem_f(St;sx;v)
By: ProveProp
Generated subgoals:None
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