We believe that Mary dropped the milk. It is probable that Lily is a rhino. There is a better than even chance that Daniel left the football. There is little chance that if 'Lily is a rhino and Daniel left the football' then Jessica is a mouse. It is probable that if 'Mary dropped the milk and Daniel left the football' then Fred went to the garden. It is likely that if 'Lily is a rhino and Daniel left the football' then Brian is white.
There is almost no chance that 'Lily is a rhino' or 'Fred went to the garden' or both.
There is a very good chance that 'Lily is a rhino' or 'Fred went to the garden' or both.
There is almost no chance that 'Lily is a rhino' or 'Fred went to the garden' or both.

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

  %hop2
  conclusion:-or(factB,factY).

  query(conclusion).
  
'Lily is a rhino' or 'Fred went to the garden' or both.