context: It is impossible that Brian is a frog. It is likely that John went to the bedroom. It is certain that Sandra dropped the milk.
hypothesis: It is probable that 'Brian is a frog' or 'John went to the bedroom' or both.
valid_hypothesis: It is probable that 'Brian is a frog' or 'John went to the bedroom' or both.
invalid_hypothesis: It is unlikely that 'Brian is a frog' or 'John went to the bedroom' 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
    0.0::factA.
    0.7::factB.
    1.0::factC.
    
  
    %hop2
    conclusion:-or(factA,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'Brian is a frog' or 'John went to the bedroom' or both.