It is highly unlikely that Julius is a frog. It is improbable that Gertrude is a mouse. It is unlikely that Emily is a wolf. We believe that if either 'Julius is a frog' or 'Gertrude is a mouse' but not both then Mary moved to the garden. It is probably not the case that if 'Gertrude is a mouse and Emily is a wolf' then John left the apple. It is almost certain that if 'Julius is a frog and Emily is a wolf' then Brian is white.
It is probable that 'Gertrude is a mouse' or 'John left the apple' or both.
It is improbable that 'Gertrude is a mouse' or 'John left the apple' or both.
It is probable that 'Gertrude is a mouse' or 'John left the apple' 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.
  0.1::factB.
  0.2::factC.
  %hop1
  0.75::factX:-xor(factA,factB).
  0.25::factY:-and(factB,factC).
  0.95::factZ:-and(factA,factC).

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

  query(conclusion).
  
'Gertrude is a mouse' or 'John left the apple' or both.