context: It is almost certain that Brian is a rhino. It is probably the case that Emily is a sheep. There is almost no chance that Jessica is a mouse. It is probable that if 'Brian is a rhino and Emily is a sheep' then Bill went to the garden. It is probably not the case that if 'Jessica is a mouse and Emily is a sheep' then Winona is a wolf. There is a better than even chance that if 'Emily is a sheep' or 'Brian is a rhino' or both then Julius is a frog.
hypothesis: It is highly unlikely that 'Winona is a wolf' or 'Bill went to the garden' or both.
valid_hypothesis: Chances are about even that 'Winona is a wolf' or 'Bill went to the garden' or both.
invalid_hypothesis: It is highly unlikely that 'Winona is a wolf' or 'Bill went to the garden' 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
    0.95::factA.
    0.7::factB.
    0.02::factC.
    %hop1
    0.7::factX:-and(factA,factB).
    0.25::factY:-and(factC,factB).
    0.6::factZ:-or(factB,factA).
  
    %hop2
    conclusion:-or(factY,factX).
  
    query(conclusion).
    
hypothesis_assertion: 'Winona is a wolf' or 'Bill went to the garden' or both.