context: It is impossible that Mary went to the hallway. Chances are slight that Bernhard is white. It is certain that John moved to the office.
hypothesis: There is little chance that 'Bernhard is white' or 'Mary went to the hallway' or both.
valid_hypothesis: There is little chance that 'Bernhard is white' or 'Mary went to the hallway' or both.
invalid_hypothesis: It is probably the case that 'Bernhard is white' or 'Mary went to the hallway' 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
    0.0::factA.
    0.1::factB.
    1.0::factC.
    
  
    %hop2
    conclusion:-or(factB,factA).
  
    query(conclusion).
    
hypothesis_assertion: 'Bernhard is white' or 'Mary went to the hallway' or both.