context: We believe that Bernhard is yellow. We believe that Emily is a wolf. It is improbable that Julius is white. It is unlikely that if 'Emily is a wolf and Bernhard is yellow' then Greg is a rhino. It is highly likely that if 'Emily is a wolf' or 'Julius is white' or both then Mary dropped the apple. It is probable that if either 'Bernhard is yellow' or 'Emily is a wolf' but not both then John went to the garden.
hypothesis: It is improbable that 'Emily is a wolf and Greg is a rhino'.
valid_hypothesis: It is improbable that 'Emily is a wolf and Greg is a rhino'.
invalid_hypothesis: It is almost certain that 'Emily is a wolf and Greg 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
    0.75::factA.
    0.75::factB.
    0.1::factC.
    %hop1
    0.2::factX:-and(factB,factA).
    0.9::factY:-or(factB,factC).
    0.7::factZ:-xor(factA,factB).
  
    %hop2
    conclusion:-and(factB,factX).
  
    query(conclusion).
    
hypothesis_assertion: 'Emily is a wolf and Greg is a rhino'.