digraph {
+ i1 [label=<I<SUB>1</SUB>>]
+ 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"]
+
earthquake -> i1
burglar -> i2
i1 -> alarm
i2 -> alarm
- earthquake -> "Newscast calls"
+ earthquake -> newscast
- alarm -> "Watson calls"
- alarm -> "Gibson calls"
+ alarm -> watson
+ alarm -> gibbons
}