Chances are slight that Greg is a rhino. It is certain that Sandra left the football. We doubt that Daniel took the apple. There is a better than even chance that if 'Daniel took the apple and Sandra left the football' then Jessica is a cat. There is a better than even chance that if 'Daniel took the apple' or 'Sandra left the football' or both then Winona is a wolf. We believe that if either 'Greg is a rhino' or 'Sandra left the football' but not both then Julius is a swan.
It is highly likely that 'Greg is a rhino and Winona is a wolf'.
It is highly unlikely that 'Greg is a rhino and Winona is a wolf'.
It is highly likely that 'Greg is a rhino and Winona 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.
  1.0::factB.
  0.2::factC.
  %hop1
  0.6::factX:-and(factC,factB).
  0.6::factY:-or(factC,factB).
  0.75::factZ:-xor(factA,factB).

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

  query(conclusion).
  
'Greg is a rhino and Winona is a wolf'.