There is a better than even chance that John discarded the apple. Chances are about even that Sumit is thirsty. It is highly likely that Brian is a lion. It is impossible that if either 'Brian is a lion' or 'John discarded the apple' but not both then Winona is a wolf. It is certain that if 'Brian is a lion' or 'Sumit is thirsty' or both then Lily is yellow. It is impossible that if 'Brian is a lion' or 'John discarded the apple' or both then Greg is a rhino.
Chances are slight that 'John discarded the apple' or 'Greg is a rhino' or both.
There is a better than even chance that 'John discarded the apple' or 'Greg is a rhino' or both.
Chances are slight that 'John discarded the apple' or 'Greg is a rhino' 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
  0.6::factA.
  0.5::factB.
  0.9::factC.
  %hop1
  0.0::factX:-xor(factC,factA).
  1.0::factY:-or(factC,factB).
  0.0::factZ:-or(factC,factA).

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

  query(conclusion).
  
'John discarded the apple' or 'Greg is a rhino' or both.