context: It is probably the case that Sandra got the football. There is a very good chance that Mary went to the office. It is highly unlikely that Brian is a rhino.
hypothesis: It is highly unlikely that 'Sandra got the football and Brian is a rhino'.
valid_hypothesis: It is highly unlikely that 'Sandra got the football and Brian is a rhino'.
invalid_hypothesis: It is likely that 'Sandra got the football and Brian 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.
    0.8::factB.
    0.05::factC.
    
  
    %hop2
    conclusion:-and(factA,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Sandra got the football and Brian is a rhino'.