It is certain that Julius is a frog. It is probably not the case that Mary is in the bathroom. It is almost certain that Sumit is bored. It is impossible that if 'Julius is a frog and Sumit is bored' then Brian is a swan. There is a very good chance that if 'Mary is in the bathroom' or 'Julius is a frog' or both then Jessica is a sheep. We doubt that if 'Julius is a frog' or 'Mary is in the bathroom' or both then John moved to the garden.
It is impossible that 'Jessica is a sheep' or 'Julius is a frog' or both.
It is certain that 'Jessica is a sheep' or 'Julius is a frog' or both.
It is impossible that 'Jessica is a sheep' or 'Julius is a frog' 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
  1.0::factA.
  0.25::factB.
  0.95::factC.
  %hop1
  0.0::factX:-and(factA,factC).
  0.8::factY:-or(factB,factA).
  0.2::factZ:-or(factA,factB).

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

  query(conclusion).
  
'Jessica is a sheep' or 'Julius is a frog' or both.