context: We believe that John went to the hallway. There is a better than even chance that Sumit is hungry. It is impossible that Julius is a swan. There is a better than even chance that if 'John went to the hallway and Sumit is hungry' then Brian is a frog. It is highly likely that if 'Julius is a swan and Sumit is hungry' then Bernhard is yellow. There is little chance that if 'John went to the hallway and Sumit is hungry' then Mary took the football.
hypothesis: It is almost certain that 'Mary took the football and Bernhard is yellow'.
valid_hypothesis: It is impossible that 'Mary took the football and Bernhard is yellow'.
invalid_hypothesis: It is almost certain that 'Mary took the football and Bernhard is yellow'.
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
    0.75::factA.
    0.6::factB.
    0.0::factC.
    %hop1
    0.6::factX:-and(factA,factB).
    0.9::factY:-and(factC,factB).
    0.1::factZ:-and(factA,factB).
  
    %hop2
    conclusion:-and(factZ,factY).
  
    query(conclusion).
    
hypothesis_assertion: 'Mary took the football and Bernhard is yellow'.