There is a better than even chance that Brian is a lion. We believe that Mary left the football. There is a very good chance that Greg is a rhino. There is a better than even chance that if 'Brian is a lion' or 'Greg is a rhino' or both then Sandra got the milk. There is little chance that if 'Brian is a lion and Mary left the football' then Julius is yellow. It is probably the case that if either 'Mary left the football' or 'Greg is a rhino' but not both then Bill went to the kitchen.
It is probable that 'Brian is a lion and Sandra got the milk'.
It is probably not the case that 'Brian is a lion and Sandra got the milk'.
It is probable that 'Brian is a lion and Sandra got the milk'.

  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
  0.6::factA.
  0.75::factB.
  0.8::factC.
  %hop1
  0.6::factX:-or(factA,factC).
  0.1::factY:-and(factA,factB).
  0.7::factZ:-xor(factB,factC).

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

  query(conclusion).
  
'Brian is a lion and Sandra got the milk'.