It is highly likely that Lily is a rhino. It is highly likely that Julius is a frog. It is impossible that Brian is a lion. We doubt that if either 'Lily is a rhino' or 'Julius is a frog' but not both then Emily is a cat. It is highly likely that if 'Lily is a rhino' or 'Julius is a frog' or both then Jeff left the apple. It is probably not the case that if 'Brian is a lion and Julius is a frog' then Bernhard is yellow.
It is highly likely that 'Emily is a cat' or 'Bernhard is yellow' or both.
It is highly unlikely that 'Emily is a cat' or 'Bernhard is yellow' or both.
It is highly likely that 'Emily is a cat' or 'Bernhard is yellow' 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
  0.9::factA.
  0.9::factB.
  0.0::factC.
  %hop1
  0.2::factX:-xor(factA,factB).
  0.9::factY:-or(factA,factB).
  0.25::factZ:-and(factC,factB).

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

  query(conclusion).
  
'Emily is a cat' or 'Bernhard is yellow' or both.