person = {1,...,5}

Trusts(person, person)
MarketTo(person)
Buys(person)

0.6 Buys(x1) ^ Trusts(x2, x1) => Buys(x2)

0.8 MarketTo(x) => Buys(x)

-2:20 Buys(x)

:-1 MarketTo(x)