context: It is impossible that Bill went to the kitchen. It is probable that Julius is a frog. There is a better than even chance that Bernhard is yellow.
hypothesis: There is a better than even chance that 'Bernhard is yellow' or 'Bill went to the kitchen' or both.
valid_hypothesis: There is a better than even chance that 'Bernhard is yellow' or 'Bill went to the kitchen' or both.
invalid_hypothesis: There is little chance that 'Bernhard is yellow' or 'Bill went to the kitchen' 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.
    0.6::factC.
    
  
    %hop2
    conclusion:-or(factC,factA).
  
    query(conclusion).
    
hypothesis_assertion: 'Bernhard is yellow' or 'Bill went to the kitchen' or both.