At: P  causal  switchable0 2 1 2 2 1 1 1 2 1
1. E: EventStruct
2. x: |E| List
3. y: |E| List
4. 
tr':|E| List. tr' 
 x 
 (
x
tr'.(
y
tr'.is-send(E)(y)  &  (y =msg=(E) x)))
5. a: |E|
6. y = filter(
b.
(b =msg=(E) a);x)
7. tr': |E| List
8. tr' 
 y
9. tr: |E| List
10. tr 
 x
11. tr' = filter(
b.
(b =msg=(E) a);tr)
12. 
x:|E|. (x 
 tr) 
 (
y
tr.is-send(E)(y)  &  (y =msg=(E) x))
13. x1: |E|
14. (x1 
 tr')
15. y1: |E|
16. (y1 
 tr)
17. is-send(E)(y1)
18. y1 =msg=(E) x1
19. y1 =msg=(E) a
20. (x1 
 tr)
21. 
(x1 =msg=(E) a)
 
 False
By: Analyze -1
Generated subgoal:| 1 |    x1 =msg=(E) a | 
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