2. i : Id
3. (
loc.
(once(loc;a;i))) 
Dsys
4. D' : Dsys
5.
loc.(once(loc;a;i)) 
D'
6. w : World
7. p : FairFifo
8. PossibleWorld(D';w)
9. @i: ma-single-pre-init1("done";
;false
;a;Unit;x,v.
x) Dsys
10. vartype(i;"done")
r
11.
e:E. loc(e) = i 
first(e) ("done" when e) = false
12.
e:E. loc(e) = i kind(e) = locl(a) (valtype(e) r Unit)
13.
e:E. loc(e) = i kind(e) = locl(a) ("done" when e)
14. e : E
15. loc(e) = i
16. kind(e) = locl(a)
(v:Unit. ("done" after e))
17.
e@i.("done" after e) = ("done" when e) kind(e) = locl(a)
18.
e':E.
18. loc(e') = i
18.
18. (
e:E. (e <loc e') kind(e) = locl(a) kind(e') = locl(a))
19. e1 : E
20. loc(e1) = i
21. e' : E
22. loc(e') = i
23. kind(e1) = locl(a)
24. kind(e') = locl(a)
e1 = e'
