context: It is improbable that Mary grabbed the milk. We doubt that Emily is a mouse. There is a better than even chance that Jessica is a wolf.
hypothesis: We believe that 'Emily is a mouse and Jessica is a wolf'.
valid_hypothesis: There is little chance that 'Emily is a mouse and Jessica is a wolf'.
invalid_hypothesis: We believe that 'Emily is a mouse and Jessica is a wolf'.
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.
    0.2::factB.
    0.6::factC.
    
  
    %hop2
    conclusion:-and(factB,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Emily is a mouse and Jessica is a wolf'.