It is almost certain that Emily is a cat. It is almost certain that Mary left the football. There is almost no chance that Julius is a rhino. It is improbable that if either 'Mary left the football' or 'Julius is a rhino' but not both then Brian is a frog. It is probably the case that if 'Julius is a rhino and Mary left the football' then Sandra grabbed the apple. There is a better than even chance that if either 'Mary left the football' or 'Julius is a rhino' but not both then Greg is a swan.
It is almost certain that 'Brian is a frog' or 'Emily is a cat' or both.
It is almost certain that 'Brian is a frog' or 'Emily is a cat' or both.
Chances are slight that 'Brian is a frog' or 'Emily 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
  0.95::factA.
  0.95::factB.
  0.02::factC.
  %hop1
  0.1::factX:-xor(factB,factC).
  0.7::factY:-and(factC,factB).
  0.6::factZ:-xor(factB,factC).

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

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