context: It is improbable that Mary went to the hallway. It is likely that Daniel dropped the apple. It is certain that Greg is a rhino.
hypothesis: There is almost no chance that 'Daniel dropped the apple and Greg is a rhino'.
valid_hypothesis: It is likely that 'Daniel dropped the apple and Greg is a rhino'.
invalid_hypothesis: There is almost no chance that 'Daniel dropped the apple and Greg is a rhino'.
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.
    1.0::factC.
    
  
    %hop2
    conclusion:-and(factB,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Daniel dropped the apple and Greg is a rhino'.