There is a better than even chance that Winona is a mouse. We doubt that Gertrude is a mouse. There is almost no chance that Jeff discarded the milk. We believe that if 'Winona is a mouse' or 'Gertrude is a mouse' or both then Mary moved to the office. We doubt that if either 'Winona is a mouse' or 'Gertrude is a mouse' but not both then Brian is a lion. It is highly unlikely that if 'Jeff discarded the milk' or 'Winona is a mouse' or both then Julius is green.
It is impossible that 'Gertrude is a mouse and Jeff discarded the milk'.
It is impossible that 'Gertrude is a mouse and Jeff discarded the milk'.
It is probably the case that 'Gertrude is a mouse and Jeff discarded 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.
  0.2::factB.
  0.02::factC.
  %hop1
  0.75::factX:-or(factA,factB).
  0.2::factY:-xor(factA,factB).
  0.05::factZ:-or(factC,factA).

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

  query(conclusion).
  
'Gertrude is a mouse and Jeff discarded the milk'.