context: Chances are slight that Winona is a cat. We believe that Julius is white. It is improbable that Greg is a rhino. It is likely that if 'Julius is white' or 'Greg is a rhino' or both then Sandra left the football. Chances are about even that if 'Julius is white' or 'Winona is a cat' or both then Jessica is a mouse. It is improbable that if either 'Greg is a rhino' or 'Winona is a cat' but not both then Mary went to the kitchen.
hypothesis: It is impossible that 'Jessica is a mouse and Mary went to the kitchen'.
valid_hypothesis: It is impossible that 'Jessica is a mouse and Mary went to the kitchen'.
invalid_hypothesis: We believe that 'Jessica is a mouse and Mary went to the kitchen'.
problog: 
    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.
    0.75::factB.
    0.1::factC.
    %hop1
    0.7::factX:-or(factB,factC).
    0.5::factY:-or(factB,factA).
    0.1::factZ:-xor(factC,factA).
  
    %hop2
    conclusion:-and(factY,factZ).
  
    query(conclusion).
    
hypothesis_assertion: 'Jessica is a mouse and Mary went to the kitchen'.