Chances are slight that Winona is a mouse. There is almost no chance that Greg is a rhino. There is almost no chance that Mary got the football. It is probably not the case that if 'Winona is a mouse' or 'Mary got the football' or both then Fred is in the office. It is probably the case that if 'Winona is a mouse' or 'Mary got the football' or both then Antoine is hungry. It is improbable that if 'Mary got the football' or 'Winona is a mouse' or both then Lily is a lion.
There is a better than even chance that 'Winona is a mouse' or 'Greg is a rhino' or both.
There is little chance that 'Winona is a mouse' or 'Greg is a rhino' or both.
There is a better than even chance that 'Winona is a mouse' or 'Greg is a rhino' or both.

  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.
  0.02::factB.
  0.02::factC.
  %hop1
  0.25::factX:-or(factA,factC).
  0.7::factY:-or(factA,factC).
  0.1::factZ:-or(factC,factA).

  %hop2
  conclusion:-or(factA,factB).

  query(conclusion).
  
'Winona is a mouse' or 'Greg is a rhino' or both.