30. f : Action(destination(l))
31. (t1.a(destination(l);t1)) = f 32. P : Action(destination(l)) 33. (a.isrcv(l;a)) = P 34. P(f(time(e)))
||filter(P;map(f;upto(time(e))))||<||filter(P;map(f;upto(time(e'))))||
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