context: It is likely that John got the apple. It is highly unlikely that Julius is a rhino. We doubt that Yann is hungry.
hypothesis: There is little chance that 'John got the apple and Yann is hungry'.
valid_hypothesis: There is little chance that 'John got the apple and Yann is hungry'.
invalid_hypothesis: It is highly likely that 'John got the apple and Yann is hungry'.
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.
    0.05::factB.
    0.2::factC.
    
  
    %hop2
    conclusion:-and(factA,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'John got the apple and Yann is hungry'.