context: Chances are about even that Mary moved to the garden. It is probably not the case that Julius is yellow. It is unlikely that Yann is hungry.
hypothesis: It is likely that 'Mary moved to the garden and Yann is hungry'.
valid_hypothesis: There is little chance that 'Mary moved to the garden and Yann is hungry'.
invalid_hypothesis: It is likely that 'Mary moved to the garden 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
    0.5::factA.
    0.25::factB.
    0.2::factC.
    
  
    %hop2
    conclusion:-and(factA,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Mary moved to the garden and Yann is hungry'.