It is certain that Lily is a rhino. We believe that Bernhard is a frog. There is a better than even chance that Julius is yellow. It is unlikely that if 'Bernhard is a frog and Julius is yellow' then Greg is gray. There is little chance that if 'Lily is a rhino' or 'Julius is yellow' or both then Mary dropped the apple. It is highly unlikely that if 'Bernhard is a frog and Julius is yellow' then Gertrude is a wolf.
There is almost no chance that 'Lily is a rhino' or 'Mary dropped the apple' or both.
It is certain that 'Lily is a rhino' or 'Mary dropped the apple' or both.
There is almost no chance that 'Lily is a rhino' or 'Mary dropped 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
  1.0::factA.
  0.75::factB.
  0.6::factC.
  %hop1
  0.2::factX:-and(factB,factC).
  0.1::factY:-or(factA,factC).
  0.05::factZ:-and(factB,factC).

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

  query(conclusion).
  
'Lily is a rhino' or 'Mary dropped the apple' or both.