It is probably not the case that John put down the apple. It is probably the case that Bernhard is a frog. There is little chance that Gertrude is a sheep. It is unlikely that if either 'Bernhard is a frog' or 'John put down the apple' but not both then Sandra got the milk. It is probable that if 'Gertrude is a sheep and John put down the apple' then Greg is a lion. It is certain that if 'John put down the apple' or 'Gertrude is a sheep' or both then Mary went to the kitchen.
It is improbable that 'Sandra got the milk and Bernhard is a frog'.
It is improbable that 'Sandra got the milk and Bernhard is a frog'.
It is almost certain that 'Sandra got the milk and Bernhard is a frog'.

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

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

  query(conclusion).
  
'Sandra got the milk and Bernhard is a frog'.