context: It is probably not the case that John moved to the office. It is improbable that Brian is a frog. There is a better than even chance that Mary went to the bedroom.
hypothesis: It is likely that 'Mary went to the bedroom' or 'John moved to the office' or both.
valid_hypothesis: It is likely that 'Mary went to the bedroom' or 'John moved to the office' or both.
invalid_hypothesis: We doubt that 'Mary went to the bedroom' or 'John moved to the office' or both.
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
    0.25::factA.
    0.1::factB.
    0.6::factC.
    
  
    %hop2
    conclusion:-or(factC,factA).
  
    query(conclusion).
    
hypothesis_assertion: 'Mary went to the bedroom' or 'John moved to the office' or both.