context: It is likely that Brian is a frog. There is little chance that Bernhard is yellow. It is highly likely that Jason is tired.
hypothesis: It is highly unlikely that 'Bernhard is yellow and Brian is a frog'.
valid_hypothesis: It is highly unlikely that 'Bernhard is yellow and Brian is a frog'.
invalid_hypothesis: It is certain that 'Bernhard is yellow and Brian is a frog'.
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
    0.7::factA.
    0.1::factB.
    0.9::factC.
    
  
    %hop2
    conclusion:-and(factB,factA).
  
    query(conclusion).
    
hypothesis_assertion: 'Bernhard is yellow and Brian is a frog'.