context: It is highly unlikely that John is in the garden. Chances are slight that Julius is a frog. It is almost certain that Greg is a rhino.
hypothesis: It is likely that 'Greg is a rhino and Julius is a frog'.
valid_hypothesis: There is little chance that 'Greg is a rhino and Julius is a frog'.
invalid_hypothesis: It is likely that 'Greg is a rhino and Julius is a frog'.
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
    0.05::factA.
    0.1::factB.
    0.95::factC.
    
  
    %hop2
    conclusion:-and(factC,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'Greg is a rhino and Julius is a frog'.