There is little chance that Emily is a mouse. It is highly likely that Lily is green. There is a very good chance that Bernhard is green. We believe that if 'Bernhard is green and Lily is green' then Winona is a wolf. We believe that if 'Bernhard is green and Lily is green' then Sandra dropped the milk. It is probably the case that if 'Emily is a mouse and Lily is green' then Julius is a lion.
It is unlikely that 'Sandra dropped the milk' or 'Bernhard is green' or both.
There is a very good chance that 'Sandra dropped the milk' or 'Bernhard is green' or both.
It is unlikely that 'Sandra dropped the milk' or 'Bernhard is green' 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
  0.1::factA.
  0.9::factB.
  0.8::factC.
  %hop1
  0.75::factX:-and(factC,factB).
  0.75::factY:-and(factC,factB).
  0.7::factZ:-and(factA,factB).

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

  query(conclusion).
  
'Sandra dropped the milk' or 'Bernhard is green' or both.