context: It is highly likely that Jeff moved to the office. It is impossible that Julius is a rhino. It is improbable that John went to the kitchen. It is highly likely that if 'John went to the kitchen and Julius is a rhino' then Lily is green. It is highly likely that if either 'Julius is a rhino' or 'Jeff moved to the office' but not both then Fred dropped the milk. There is almost no chance that if either 'John went to the kitchen' or 'Julius is a rhino' but not both then Brian is white.
hypothesis: It is highly likely that 'Jeff moved to the office' or 'Fred dropped the milk' or both.
valid_hypothesis: It is highly likely that 'Jeff moved to the office' or 'Fred dropped the milk' or both.
invalid_hypothesis: We doubt that 'Jeff moved to the office' or 'Fred dropped the milk' 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
    0.9::factA.
    0.0::factB.
    0.1::factC.
    %hop1
    0.9::factX:-and(factC,factB).
    0.9::factY:-xor(factB,factA).
    0.02::factZ:-xor(factC,factB).
  
    %hop2
    conclusion:-or(factA,factY).
  
    query(conclusion).
    
hypothesis_assertion: 'Jeff moved to the office' or 'Fred dropped the milk' or both.