context: There is a very good chance that Winona is a wolf. There is a very good chance that Greg is a swan. There is a better than even chance that Bernhard is green. It is improbable that if 'Bernhard is green' or 'Winona is a wolf' or both then John moved to the garden. There is little chance that if 'Winona is a wolf and Bernhard is green' then Emily is a wolf. It is probably not the case that if either 'Bernhard is green' or 'Greg is a swan' but not both then Mary dropped the milk.
hypothesis: It is highly unlikely that 'Bernhard is green and Winona is a wolf'.
valid_hypothesis: Chances are about even that 'Bernhard is green and Winona is a wolf'.
invalid_hypothesis: It is highly unlikely that 'Bernhard is green and Winona is a wolf'.
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
    0.8::factA.
    0.8::factB.
    0.6::factC.
    %hop1
    0.1::factX:-or(factC,factA).
    0.1::factY:-and(factA,factC).
    0.25::factZ:-xor(factC,factB).
  
    %hop2
    conclusion:-and(factC,factA).
  
    query(conclusion).
    
hypothesis_assertion: 'Bernhard is green and Winona is a wolf'.