It is improbable that John got the apple. It is likely that Winona is a mouse. We doubt that Julius is a lion. Chances are about even that if either 'John got the apple' or 'Winona is a mouse' but not both then Greg is a frog. There is little chance that if 'John got the apple' or 'Julius is a lion' or both then Bill went to the kitchen. It is certain that if 'Winona is a mouse' or 'John got the apple' or both then Sandra left the football.
There is almost no chance that 'Bill went to the kitchen and Julius is a lion'.
There is almost no chance that 'Bill went to the kitchen and Julius is a lion'.
There is a better than even chance that 'Bill went to the kitchen and Julius is a lion'.

  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.
  0.7::factB.
  0.2::factC.
  %hop1
  0.5::factX:-xor(factA,factB).
  0.1::factY:-or(factA,factC).
  1.0::factZ:-or(factB,factA).

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

  query(conclusion).
  
'Bill went to the kitchen and Julius is a lion'.