context: There is a better than even chance that Emily is a mouse. Chances are slight that Daniel left the milk. It is unlikely that Lily is white. It is almost certain that if 'Emily is a mouse' or 'Daniel left the milk' or both then Bernhard is a frog. It is probably the case that if either 'Lily is white' or 'Daniel left the milk' but not both then Brian is a rhino. We believe that if 'Daniel left the milk and Lily is white' then Mary went to the bedroom.
hypothesis: It is probable that 'Brian is a rhino' or 'Lily is white' or both.
valid_hypothesis: It is probably not the case that 'Brian is a rhino' or 'Lily is white' or both.
invalid_hypothesis: It is probable that 'Brian is a rhino' or 'Lily is white' 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
    0.6::factA.
    0.1::factB.
    0.2::factC.
    %hop1
    0.95::factX:-or(factA,factB).
    0.7::factY:-xor(factC,factB).
    0.75::factZ:-and(factB,factC).
  
    %hop2
    conclusion:-or(factY,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Brian is a rhino' or 'Lily is white' or both.