There is a better than even chance that Julius is a swan. We believe that Gertrude is a wolf. We doubt that Emily is a mouse. It is likely that if 'Gertrude is a wolf' or 'Julius is a swan' or both then John grabbed the apple. It is unlikely that if 'Emily is a mouse' or 'Gertrude is a wolf' or both then Greg is gray. Chances are slight that if 'Emily is a mouse' or 'Julius is a swan' or both then Bernhard is yellow.
Chances are about even that 'Gertrude is a wolf and John grabbed the apple'.
Chances are about even that 'Gertrude is a wolf and John grabbed the apple'.
It is almost certain that 'Gertrude is a wolf and John grabbed the apple'.

  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
  0.6::factA.
  0.75::factB.
  0.2::factC.
  %hop1
  0.7::factX:-or(factB,factA).
  0.2::factY:-or(factC,factB).
  0.1::factZ:-or(factC,factA).

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

  query(conclusion).
  
'Gertrude is a wolf and John grabbed the apple'.