It is probably not the case that John got the apple. It is probable that Bill went to the garden. There is a very good chance that Jessica is a mouse. It is probably not the case that if 'Bill went to the garden' or 'Jessica is a mouse' or both then Emily is a wolf. It is unlikely that if 'Jessica is a mouse and John got the apple' then Brian is green. It is probable that if 'Jessica is a mouse' or 'John got the apple' or both then Bernhard is a lion.
We doubt that 'Bernhard is a lion and John got the apple'.
We doubt that 'Bernhard is a lion and John got the apple'.
There is a very good chance that 'Bernhard is a lion and John got 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
  0.25::factA.
  0.7::factB.
  0.8::factC.
  %hop1
  0.25::factX:-or(factB,factC).
  0.2::factY:-and(factC,factA).
  0.7::factZ:-or(factC,factA).

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

  query(conclusion).
  
'Bernhard is a lion and John got the apple'.