We doubt that Lily is a frog. There is a very good chance that Bernhard is a lion. It is highly unlikely that Julius is a rhino. We doubt that if 'Julius is a rhino' or 'Bernhard is a lion' or both then Daniel got the football. It is highly likely that if either 'Bernhard is a lion' or 'Julius is a rhino' but not both then Mary put down the apple. It is probable that if 'Lily is a frog' or 'Bernhard is a lion' or both then Brian is green.
It is probable that 'Julius is a rhino' or 'Lily is a frog' or both.
It is probably not the case that 'Julius is a rhino' or 'Lily is a frog' or both.
It is probable that 'Julius is a rhino' or 'Lily 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
  0.2::factA.
  0.8::factB.
  0.05::factC.
  %hop1
  0.2::factX:-or(factC,factB).
  0.9::factY:-xor(factB,factC).
  0.7::factZ:-or(factA,factB).

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

  query(conclusion).
  
'Julius is a rhino' or 'Lily is a frog' or both.