It is probably not the case that Jessica is a cat. There is almost no chance that John went to the office. Chances are slight that Lily is a lion. There is almost no chance that if either 'John went to the office' or 'Lily is a lion' but not both then Julius is white. It is almost certain that if either 'Jessica is a cat' or 'Lily is a lion' but not both then Sandra took the milk. There is almost no chance that if 'Jessica is a cat and Lily is a lion' then Brian is white.
Chances are about even that 'Jessica is a cat and Julius is white'.
It is impossible that 'Jessica is a cat and Julius is white'.
Chances are about even that 'Jessica is a cat and Julius is white'.

  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.
  0.02::factB.
  0.1::factC.
  %hop1
  0.02::factX:-xor(factB,factC).
  0.95::factY:-xor(factA,factC).
  0.02::factZ:-and(factA,factC).

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

  query(conclusion).
  
'Jessica is a cat and Julius is white'.