context: It is highly likely that Bernhard is green. We doubt that Brian is a rhino. It is likely that Emily is a wolf. There is a very good chance that if either 'Brian is a rhino' or 'Bernhard is green' but not both then Lily is a lion. It is probable that if 'Emily is a wolf and Bernhard is green' then John got the milk. It is unlikely that if either 'Emily is a wolf' or 'Brian is a rhino' but not both then Yann is tired.
hypothesis: It is improbable that 'John got the milk and Brian is a rhino'.
valid_hypothesis: It is improbable that 'John got the milk and Brian is a rhino'.
invalid_hypothesis: It is almost certain that 'John got the milk and Brian 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
    0.9::factA.
    0.2::factB.
    0.7::factC.
    %hop1
    0.8::factX:-xor(factB,factA).
    0.7::factY:-and(factC,factA).
    0.2::factZ:-xor(factC,factB).
  
    %hop2
    conclusion:-and(factY,factB).
  
    query(conclusion).
    
hypothesis_assertion: 'John got the milk and Brian is a rhino'.