It is probable that Lily is a rhino. There is a better than even chance that Julius is a frog. There is almost no chance that Mary went to the office. It is certain that if 'Mary went to the office and Lily is a rhino' then Jessica is a sheep. We doubt that if 'Julius is a frog' or 'Lily is a rhino' or both then John got the milk. It is certain that if 'Julius is a frog' or 'Lily is a rhino' or both then Brian is a swan.
It is improbable that 'Jessica is a sheep' or 'Brian is a swan' or both.
It is highly likely that 'Jessica is a sheep' or 'Brian is a swan' or both.
It is improbable that 'Jessica is a sheep' or 'Brian is a swan' 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
  0.7::factA.
  0.6::factB.
  0.02::factC.
  %hop1
  1.0::factX:-and(factC,factA).
  0.2::factY:-or(factB,factA).
  1.0::factZ:-or(factB,factA).

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

  query(conclusion).
  
'Jessica is a sheep' or 'Brian is a swan' or both.