context: There is little chance that Bernhard is a frog. We believe that Emily is a mouse. It is certain that Lily is a frog.
hypothesis: It is impossible that 'Lily is a frog and Emily is a mouse'.
valid_hypothesis: We believe that 'Lily is a frog and Emily is a mouse'.
invalid_hypothesis: It is impossible that 'Lily is a frog and Emily 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
    0.1::factA.
    0.75::factB.
    1.0::factC.
    
  
    %hop2
    conclusion:-and(factC,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'Lily is a frog and Emily is a mouse'.