context: We believe that Emily is a sheep. It is highly unlikely that John went to the office. It is unlikely that Mary got the football.
hypothesis: It is improbable that 'Emily is a sheep and Mary got the football'.
valid_hypothesis: It is improbable that 'Emily is a sheep and Mary got the football'.
invalid_hypothesis: There is a better than even chance that 'Emily is a sheep and Mary got the football'.
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.
    0.05::factB.
    0.2::factC.
    
  
    %hop2
    conclusion:-and(factA,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Emily is a sheep and Mary got the football'.