context: There is a very good chance that Emily is a mouse. It is highly likely that Bill went to the bedroom. It is highly unlikely that Greg is white.
hypothesis: It is unlikely that 'Greg is white' or 'Emily is a mouse' or both.
valid_hypothesis: There is a very good chance that 'Greg is white' or 'Emily is a mouse' or both.
invalid_hypothesis: It is unlikely that 'Greg is white' or 'Emily is a mouse' 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
    0.8::factA.
    0.9::factB.
    0.05::factC.
    
  
    %hop2
    conclusion:-or(factC,factA).
  
    query(conclusion).
    
hypothesis_assertion: 'Greg is white' or 'Emily is a mouse' or both.