context: It is unlikely that Greg is a frog. It is improbable that Mary went to the office. It is improbable that Emily is a sheep.
hypothesis: It is probable that 'Mary went to the office' or 'Emily is a sheep' or both.
valid_hypothesis: It is unlikely that 'Mary went to the office' or 'Emily is a sheep' or both.
invalid_hypothesis: It is probable that 'Mary went to the office' or 'Emily is a sheep' 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
    0.2::factA.
    0.1::factB.
    0.1::factC.
    
  
    %hop2
    conclusion:-or(factB,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Mary went to the office' or 'Emily is a sheep' or both.