context: It is almost certain that Sandra left the football. Chances are about even that Greg is green. We doubt that Mary went to the bedroom.
hypothesis: It is unlikely that 'Sandra left the football and Mary went to the bedroom'.
valid_hypothesis: It is unlikely that 'Sandra left the football and Mary went to the bedroom'.
invalid_hypothesis: It is probably the case that 'Sandra left the football and Mary went to the bedroom'.
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
    0.95::factA.
    0.5::factB.
    0.2::factC.
    
  
    %hop2
    conclusion:-and(factA,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Sandra left the football and Mary went to the bedroom'.