context: It is impossible that John grabbed the apple. There is almost no chance that Brian is a frog. It is likely that Bill got the milk there. It is probably not the case that if 'Bill got the milk there and Brian is a frog' then Sumit is thirsty. Chances are about even that if either 'Brian is a frog' or 'Bill got the milk there' but not both then Jessica is a mouse. It is impossible that if either 'Brian is a frog' or 'John grabbed the apple' but not both then Julius is a lion.
hypothesis: It is impossible that 'Jessica is a mouse and Sumit is thirsty'.
valid_hypothesis: It is impossible that 'Jessica is a mouse and Sumit is thirsty'.
invalid_hypothesis: It is certain that 'Jessica 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
    0.0::factA.
    0.02::factB.
    0.7::factC.
    %hop1
    0.25::factX:-and(factC,factB).
    0.5::factY:-xor(factB,factC).
    0.0::factZ:-xor(factB,factA).
  
    %hop2
    conclusion:-and(factY,factX).
  
    query(conclusion).
    
hypothesis_assertion: 'Jessica is a mouse and Sumit is thirsty'.