context: It is improbable that Bernhard is white. There is a better than even chance that Lily is a rhino. There is little chance that Brian is green. It is improbable that if 'Bernhard is white and Lily is a rhino' then Jeff went to the bedroom. It is probably not the case that if 'Brian is green and Bernhard is white' then Gertrude is a sheep. There is a very good chance that if 'Brian is green' or 'Lily is a rhino' or both then Mary left the football.
hypothesis: It is highly unlikely that 'Brian is green and Lily is a rhino'.
valid_hypothesis: It is highly unlikely that 'Brian is green and Lily is a rhino'.
invalid_hypothesis: There is a very good chance that 'Brian is green and Lily 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
    0.1::factA.
    0.6::factB.
    0.1::factC.
    %hop1
    0.1::factX:-and(factA,factB).
    0.25::factY:-and(factC,factA).
    0.8::factZ:-or(factC,factB).
  
    %hop2
    conclusion:-and(factC,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'Brian is green and Lily is a rhino'.