context: Chances are slight that Julius is a lion. It is probable that John moved to the garden. There is little chance that Bernhard is a swan.
hypothesis: It is highly likely that 'Bernhard is a swan and John moved to the garden'.
valid_hypothesis: It is highly unlikely that 'Bernhard is a swan and John moved to the garden'.
invalid_hypothesis: It is highly likely that 'Bernhard is a swan and John moved to the garden'.
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.
    0.1::factC.
    
  
    %hop2
    conclusion:-and(factC,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'Bernhard is a swan and John moved to the garden'.