It is highly likely that Lily is a lion. Chances are about even that Greg is a frog. It is likely that Mary discarded the milk. Chances are slight that if 'Lily is a lion and Greg is a frog' then Antoine is hungry. It is almost certain that if 'Lily is a lion' or 'Greg is a frog' or both then John grabbed the apple. It is probably not the case that if 'Lily is a lion and Mary discarded the milk' then Brian is yellow.
There is a better than even chance that 'Mary discarded the milk and Lily is a lion'.
There is a better than even chance that 'Mary discarded the milk and Lily is a lion'.
There is little chance that 'Mary discarded the milk and Lily is a lion'.

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

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

  query(conclusion).
  
'Mary discarded the milk and Lily is a lion'.