context: There is a better than even chance that Bernhard is a frog. We believe that Mary got the football. It is highly likely that John moved to the garden.
hypothesis: There is almost no chance that 'Mary got the football' or 'Bernhard is a frog' or both.
valid_hypothesis: It is highly likely that 'Mary got the football' or 'Bernhard is a frog' or both.
invalid_hypothesis: There is almost no chance that 'Mary got the football' or 'Bernhard is a frog' or both.
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
    0.6::factA.
    0.75::factB.
    0.9::factC.
    
  
    %hop2
    conclusion:-or(factB,factA).
  
    query(conclusion).
    
hypothesis_assertion: 'Mary got the football' or 'Bernhard is a frog' or both.