 tr':|E| List. tr'
tr':|E| List. tr'  x
 x 
 (
 ( x
x tr'.(
tr'.( y
y tr'.is-send(E)(y)  &  (y =msg=(E) x)))
tr'.is-send(E)(y)  &  (y =msg=(E) x))) b.
b.
 (b =msg=(E) a);x)
(b =msg=(E) a);x) y
 y x
 x b.
b.
 (b =msg=(E) a);tr)
(b =msg=(E) a);tr) x:|E|. (x
x:|E|. (x  tr)
 tr) 
 (
 ( y
y tr.is-send(E)(y)  &  (y =msg=(E) x))
tr.is-send(E)(y)  &  (y =msg=(E) x)) tr')
 tr') y
y tr.is-send(E)(y)  &  (y =msg=(E) x1))
tr.is-send(E)(y)  &  (y =msg=(E) x1)) (
 ( y
y tr'.is-send(E)(y)  &  (y =msg=(E) x1))
tr'.is-send(E)(y)  &  (y =msg=(E) x1))| 1 | 15. y1: |E| 16. (y1  tr) 17. is-send(E)(y1) 18. y1 =msg=(E) x1  (y1  tr') | 
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