context: It is certain that Jeff moved to the garden. It is almost certain that Gertrude is a mouse. It is improbable that Sandra took the football.
hypothesis: There is little chance that 'Gertrude is a mouse and Sandra took the football'.
valid_hypothesis: There is little chance that 'Gertrude is a mouse and Sandra took the football'.
invalid_hypothesis: It is probably the case that 'Gertrude is a mouse and Sandra took the football'.
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
    1.0::factA.
    0.95::factB.
    0.1::factC.
    
  
    %hop2
    conclusion:-and(factB,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Gertrude is a mouse and Sandra took the football'.