context: It is almost certain that Mary got the football. It is unlikely that Bill moved to the office. It is improbable that Julius is a frog. It is impossible that if either 'Bill moved to the office' or 'Mary got the football' but not both then Lily is a rhino. There is a better than even chance that if 'Mary got the football and Julius is a frog' then John discarded the milk. It is unlikely that if 'Mary got the football' or 'Bill moved to the office' or both then Fred went to the garden.
hypothesis: It is likely that 'Lily is a rhino and Julius is a frog'.
valid_hypothesis: It is impossible that 'Lily is a rhino and Julius is a frog'.
invalid_hypothesis: It is likely that 'Lily is a rhino and Julius is a frog'.
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.
    0.2::factB.
    0.1::factC.
    %hop1
    0.0::factX:-xor(factB,factA).
    0.6::factY:-and(factA,factC).
    0.2::factZ:-or(factA,factB).
  
    %hop2
    conclusion:-and(factX,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Lily is a rhino and Julius is a frog'.