i2 [label=<I<SUB>2</SUB>>]
n [shape=plaintext label="Noisy OR"]
n -> alarm [style=invis]
- newscast [label="Newcast calls"]
gibbons [label="Gibbons calls"]
watson [label="Watson calls"]
+ newscast [rank=max label="Newcast calls"]
earthquake -> i1
burglar -> i2
i1 -> alarm
i2 -> alarm
- earthquake -> newscast
-
alarm -> watson
alarm -> gibbons
+ earthquake -> newscast
}