13. loc(pred(<i,t-1>)) = i Id
14. e':E.
14. (loc(pred(<i,t-1>)) = loc(e') Id & time(pred(<i,t-1>))<time(e')
14. (& loc(e') = i Id
14. (& time(e')<t-1)
pred(<i,t-1>) E
1 step
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