It is unlikely that Mary went to the kitchen. There is a better than even chance that Jessica is a cat. It is likely that Jeff left the apple. It is almost certain that if 'Jessica is a cat' or 'Mary went to the kitchen' or both then Julius is yellow. There is a very good chance that if 'Jeff left the apple' or 'Mary went to the kitchen' or both then Gertrude is a cat. It is probable that if 'Jeff left the apple and Jessica is a cat' then John discarded the milk.
It is unlikely that 'Jessica is a cat' or 'Jeff left the apple' or both.
It is highly likely that 'Jessica is a cat' or 'Jeff left the apple' or both.
It is unlikely that 'Jessica is a cat' or 'Jeff left the apple' or both.

  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
  0.2::factA.
  0.6::factB.
  0.7::factC.
  %hop1
  0.95::factX:-or(factB,factA).
  0.8::factY:-or(factC,factA).
  0.7::factZ:-and(factC,factB).

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

  query(conclusion).
  
'Jessica is a cat' or 'Jeff left the apple' or both.