It is highly likely that John went to the kitchen. We doubt that Bernhard is a lion. It is probable that Jeff dropped the apple. It is certain that if either 'Bernhard is a lion' or 'Jeff dropped the apple' but not both then Mary got the milk. There is a better than even chance that if 'Bernhard is a lion and John went to the kitchen' then Fred moved to the office. It is probable that if either 'Bernhard is a lion' or 'Jeff dropped the apple' but not both then Winona is a wolf.
There is a very good chance that 'Bernhard is a lion and Jeff dropped the apple'.
It is improbable that 'Bernhard is a lion and Jeff dropped the apple'.
There is a very good chance that 'Bernhard is a lion and Jeff dropped 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
  0.9::factA.
  0.2::factB.
  0.7::factC.
  %hop1
  1.0::factX:-xor(factB,factC).
  0.6::factY:-and(factB,factA).
  0.7::factZ:-xor(factB,factC).

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

  query(conclusion).
  
'Bernhard is a lion and Jeff dropped the apple'.