It is probably not the case that Julius is a frog. It is certain that Lily is a rhino. It is certain that John went to the kitchen. There is a better than even chance that if 'Lily is a rhino and Julius is a frog' then Antoine is hungry. It is likely that if 'Julius is a frog and John went to the kitchen' then Bernhard is green. It is unlikely that if 'John went to the kitchen and Julius is a frog' then Sandra dropped the milk.
It is unlikely that 'Lily is a rhino' or 'Julius is a frog' or both.
It is certain that 'Lily is a rhino' or 'Julius is a frog' or both.
It is unlikely that 'Lily is a rhino' 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
  0.25::factA.
  1.0::factB.
  1.0::factC.
  %hop1
  0.6::factX:-and(factB,factA).
  0.7::factY:-and(factA,factC).
  0.2::factZ:-and(factC,factA).

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

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