It is highly unlikely that Julius is gray. It is probably the case that Greg is a lion. There is a very good chance that Daniel took the apple. There is a very good chance that if 'Greg is a lion' or 'Daniel took the apple' or both then Sandra dropped the milk. It is certain that if either 'Julius is gray' or 'Greg is a lion' but not both then Gertrude is a mouse. It is almost certain that if 'Julius is gray and Daniel took the apple' then Brian is a rhino.
There is almost no chance that 'Greg is a lion and Brian is a rhino'.
There is almost no chance that 'Greg is a lion and Brian is a rhino'.
There is a very good chance that 'Greg is a lion and Brian is a rhino'.

  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
  0.05::factA.
  0.7::factB.
  0.8::factC.
  %hop1
  0.8::factX:-or(factB,factC).
  1.0::factY:-xor(factA,factB).
  0.95::factZ:-and(factA,factC).

  %hop2
  conclusion:-and(factB,factZ).

  query(conclusion).
  
'Greg is a lion and Brian is a rhino'.