Chances are slight that Julius is gray. It is impossible that Bernhard is a frog. It is highly unlikely that Mary went to the hallway. There is little chance that if either 'Bernhard is a frog' or 'Mary went to the hallway' but not both then Emily is a sheep. Chances are slight that if either 'Mary went to the hallway' or 'Bernhard is a frog' but not both then Brian is gray. It is likely that if 'Julius is gray' or 'Bernhard is a frog' or both then Lily is yellow.
There is a very good chance that 'Lily is yellow' or 'Julius is gray' or both.
Chances are slight that 'Lily is yellow' or 'Julius is gray' or both.
There is a very good chance that 'Lily is yellow' or 'Julius is gray' 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
  0.1::factA.
  0.0::factB.
  0.05::factC.
  %hop1
  0.1::factX:-xor(factB,factC).
  0.1::factY:-xor(factC,factB).
  0.7::factZ:-or(factA,factB).

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

  query(conclusion).
  
'Lily is yellow' or 'Julius is gray' or both.