There is a better than even chance that Gertrude is a cat. It is highly unlikely that Sumit is hungry. It is almost certain that Jason is tired. There is a better than even chance that if 'Sumit is hungry' or 'Jason is tired' or both then Brian is a frog. We believe that if 'Jason is tired and Gertrude is a cat' then Julius is green. Chances are about even that if 'Jason is tired' or 'Gertrude is a cat' or both then Lily is a rhino.
Chances are slight that either 'Gertrude is a cat' or 'Sumit is hungry' but not both.
There is a better than even chance that either 'Gertrude is a cat' or 'Sumit is hungry' but not both.
Chances are slight that either 'Gertrude is a cat' or 'Sumit is hungry' but not 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
  0.6::factA.
  0.05::factB.
  0.95::factC.
  %hop1
  0.6::factX:-or(factB,factC).
  0.75::factY:-and(factC,factA).
  0.5::factZ:-or(factC,factA).

  %hop2
  conclusion:-xor(factA,factB).

  query(conclusion).
  
Either 'Gertrude is a cat' or 'Sumit is hungry' but not both.