It is highly unlikely that Jessica is a mouse. We believe that Brian is white. Chances are about even that Bernhard is yellow. It is impossible that if 'Bernhard is yellow' or 'Jessica is a mouse' or both then John went to the kitchen. It is impossible that if 'Bernhard is yellow' or 'Jessica is a mouse' or both then Bill left the milk. It is probably the case that if 'Jessica is a mouse and Bernhard is yellow' then Lily is a lion.
It is almost certain that 'Lily is a lion and John went to the kitchen'.
It is impossible that 'Lily is a lion and John went to the kitchen'.
It is almost certain that 'Lily is a lion and John went to the kitchen'.

  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.
  0.75::factB.
  0.5::factC.
  %hop1
  0.0::factX:-or(factC,factA).
  0.0::factY:-or(factC,factA).
  0.7::factZ:-and(factA,factC).

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

  query(conclusion).
  
'Lily is a lion and John went to the kitchen'.