context: We doubt that Daniel dropped the apple. There is a very good chance that Fred went to the garden. It is likely that Mary moved to the office.
hypothesis: Chances are slight that 'Mary moved to the office and Daniel dropped the apple'.
valid_hypothesis: Chances are slight that 'Mary moved to the office and Daniel dropped the apple'.
invalid_hypothesis: It is highly likely that 'Mary moved to the office and Daniel dropped the apple'.
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
    0.2::factA.
    0.8::factB.
    0.7::factC.
    
  
    %hop2
    conclusion:-and(factC,factA).
  
    query(conclusion).
    
hypothesis_assertion: 'Mary moved to the office and Daniel dropped the apple'.