It is highly unlikely that Brian is a frog. Chances are about even that Jessica is a cat. There is a very good chance that Mary went to the office. There is a better than even chance that if either 'Jessica is a cat' or 'Brian is a frog' but not both then Sumit is bored. It is almost certain that if 'Brian is a frog' or 'Jessica is a cat' or both then Lily is a lion. There is a better than even chance that if 'Jessica is a cat and Brian is a frog' then John took the apple.
Chances are about even that 'Brian is a frog' or 'Jessica is a cat' or both.
Chances are about even that 'Brian is a frog' or 'Jessica is a cat' or both.
It is certain that 'Brian is a frog' or 'Jessica is a cat' 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
  0.05::factA.
  0.5::factB.
  0.8::factC.
  %hop1
  0.6::factX:-xor(factB,factA).
  0.95::factY:-or(factA,factB).
  0.6::factZ:-and(factB,factA).

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

  query(conclusion).
  
'Brian is a frog' or 'Jessica is a cat' or both.