We doubt that Lily is gray. There is almost no chance that Daniel grabbed the apple. There is almost no chance that Brian is a rhino. It is certain that if either 'Lily is gray' or 'Daniel grabbed the apple' but not both then John moved to the garden. There is almost no chance that if 'Brian is a rhino' or 'Daniel grabbed the apple' or both then Sandra got the football. It is highly unlikely that if either 'Daniel grabbed the apple' or 'Lily is gray' but not both then Mary went to the hallway.
It is impossible that 'Lily is gray and Sandra got the football'.
It is impossible that 'Lily is gray and Sandra got the football'.
It is probable that 'Lily is gray and Sandra got the football'.

  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
  0.2::factA.
  0.02::factB.
  0.02::factC.
  %hop1
  1.0::factX:-xor(factA,factB).
  0.02::factY:-or(factC,factB).
  0.05::factZ:-xor(factB,factA).

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

  query(conclusion).
  
'Lily is gray and Sandra got the football'.