context: It is highly likely that John dropped the milk. It is almost certain that Brian is a rhino. It is improbable that Emily is a mouse. It is impossible that if 'Emily is a mouse' or 'Brian is a rhino' or both then Sumit is thirsty. It is certain that if 'Brian is a rhino and John dropped the milk' then Bill moved to the office. It is probably not the case that if 'John dropped the milk and Emily is a mouse' then Mary went to the office.
hypothesis: It is impossible that 'Emily is a mouse and Sumit is thirsty'.
valid_hypothesis: It is impossible that 'Emily is a mouse and Sumit is thirsty'.
invalid_hypothesis: There is a very good chance that 'Emily is a mouse and Sumit is thirsty'.
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
    0.9::factA.
    0.95::factB.
    0.1::factC.
    %hop1
    0.0::factX:-or(factC,factB).
    1.0::factY:-and(factB,factA).
    0.25::factZ:-and(factA,factC).
  
    %hop2
    conclusion:-and(factC,factX).
  
    query(conclusion).
    
hypothesis_assertion: 'Emily is a mouse and Sumit is thirsty'.