It is highly likely that Greg is a frog. It is probable that Brian is a rhino. It is almost certain that Julius is a swan. Chances are slight that if 'Julius is a swan' or 'Brian is a rhino' or both then Sandra dropped the milk. Chances are slight that if either 'Greg is a frog' or 'Brian is a rhino' but not both then Lily is green. It is highly likely that if 'Brian is a rhino and Greg is a frog' then John grabbed the apple.
There is almost no chance that 'Lily is green and Julius is a swan'.
There is almost no chance that 'Lily is green and Julius is a swan'.
There is a better than even chance that 'Lily is green and Julius is a swan'.

  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.
  0.7::factB.
  0.95::factC.
  %hop1
  0.1::factX:-or(factC,factB).
  0.1::factY:-xor(factA,factB).
  0.9::factZ:-and(factB,factA).

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

  query(conclusion).
  
'Lily is green and Julius is a swan'.