; @author David Weber
(format PTRS)
(fun a 0)
(fun b 0)
(fun c 0)
(fun d 0)
(fun e 0)
(prule a ((b :prob 1) (c :prob 1)))
(prule b ((d :prob 1)))
(prule b ((e :prob 1)))
(prule c ((d :prob 1)))
(prule c ((e :prob 1)))