It is improbable that Antoine is thirsty. It is highly unlikely that Sandra got the football. It is probably the case that Bernhard is a rhino. It is improbable that if 'Antoine is thirsty and Bernhard is a rhino' then Gertrude is a wolf. It is improbable that if 'Bernhard is a rhino' or 'Antoine is thirsty' or both then Mary grabbed the milk. We doubt that if 'Sandra got the football' or 'Bernhard is a rhino' or both then John dropped the apple.
It is impossible that 'Mary grabbed the milk and Gertrude is a wolf'.
It is impossible that 'Mary grabbed the milk and Gertrude is a wolf'.
It is almost certain that 'Mary grabbed the milk and Gertrude is a wolf'.

  and(A,B) :- A,B.
  or(A,B) :- A;B.
  nand(A,B) :- not(and(A,B)).
  nor(A,B) :- not(or(A,B)).
  xor(A,B) :- or(A,B), nand(A,B).

  %hop0
  0.1::factA.
  0.05::factB.
  0.7::factC.
  %hop1
  0.1::factX:-and(factA,factC).
  0.1::factY:-or(factC,factA).
  0.2::factZ:-or(factB,factC).

  %hop2
  conclusion:-and(factY,factX).

  query(conclusion).
  
'Mary grabbed the milk and Gertrude is a wolf'.