context: There is little chance that Jason is tired. It is probable that Brian is a swan. There is a very good chance that John picked up the apple.
hypothesis: It is highly unlikely that 'Jason is tired and Brian is a swan'.
valid_hypothesis: It is highly unlikely that 'Jason is tired and Brian is a swan'.
invalid_hypothesis: It is highly likely that 'Jason is tired and Brian is a swan'.
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
    0.1::factA.
    0.7::factB.
    0.8::factC.
    
  
    %hop2
    conclusion:-and(factA,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'Jason is tired and Brian is a swan'.