context: There is almost no chance that Emily is a cat. There is a better than even chance that Brian is a lion. There is almost no chance that John moved to the office. It is certain that if 'John moved to the office' or 'Emily is a cat' or both then Lily is white. It is likely that if 'John moved to the office and Emily is a cat' then Mary went to the office. It is improbable that if 'John moved to the office and Emily is a cat' then Bernhard is green.
hypothesis: There is a very good chance that 'Mary went to the office and Lily is white'.
valid_hypothesis: It is impossible that 'Mary went to the office and Lily is white'.
invalid_hypothesis: There is a very good chance that 'Mary went to the office and Lily is white'.
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
    0.02::factA.
    0.6::factB.
    0.02::factC.
    %hop1
    1.0::factX:-or(factC,factA).
    0.7::factY:-and(factC,factA).
    0.1::factZ:-and(factC,factA).
  
    %hop2
    conclusion:-and(factY,factX).
  
    query(conclusion).
    
hypothesis_assertion: 'Mary went to the office and Lily is white'.