context: Chances are about even that Mary went to the garden. It is highly unlikely that Daniel got the milk. It is likely that Brian is a frog. It is improbable that if 'Daniel got the milk' or 'Mary went to the garden' or both then Winona is a cat. It is likely that if either 'Daniel got the milk' or 'Mary went to the garden' but not both then Julius is green. We doubt that if either 'Brian is a frog' or 'Daniel got the milk' but not both then John moved to the office.
hypothesis: It is highly unlikely that 'Julius is green and John moved to the office'.
valid_hypothesis: It is highly unlikely that 'Julius is green and John moved to the office'.
invalid_hypothesis: It is highly likely that 'Julius is green and John moved to the office'.
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.
    0.05::factB.
    0.7::factC.
    %hop1
    0.1::factX:-or(factB,factA).
    0.7::factY:-xor(factB,factA).
    0.2::factZ:-xor(factC,factB).
  
    %hop2
    conclusion:-and(factY,factZ).
  
    query(conclusion).
    
hypothesis_assertion: 'Julius is green and John moved to the office'.