context: It is probably the case that Bill moved to the office. It is highly likely that Gertrude is a wolf. There is a very good chance that Julius is a rhino.
hypothesis: There is almost no chance that 'Bill moved to the office and Julius is a rhino'.
valid_hypothesis: There is a better than even chance that 'Bill moved to the office and Julius is a rhino'.
invalid_hypothesis: There is almost no chance that 'Bill moved to the office and Julius is a rhino'.
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
    0.7::factA.
    0.9::factB.
    0.8::factC.
    
  
    %hop2
    conclusion:-and(factA,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Bill moved to the office and Julius is a rhino'.