context: There is a better than even chance that Jessica is a mouse. It is highly likely that Brian is a frog. We doubt that Sandra dropped the milk.
hypothesis: Chances are about even that 'Brian is a frog and Jessica is a mouse'.
valid_hypothesis: Chances are about even that 'Brian is a frog and Jessica is a mouse'.
invalid_hypothesis: It is almost certain that 'Brian is a frog and Jessica is a mouse'.
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
    0.6::factA.
    0.9::factB.
    0.2::factC.
    
  
    %hop2
    conclusion:-and(factB,factA).
  
    query(conclusion).
    
hypothesis_assertion: 'Brian is a frog and Jessica is a mouse'.