context: It is probably the case that Emily is a sheep. There is little chance that Bernhard is a frog. It is probable that Lily is a lion.
hypothesis: There is a better than even chance that 'Bernhard is a frog and Emily is a sheep'.
valid_hypothesis: It is highly unlikely that 'Bernhard is a frog and Emily is a sheep'.
invalid_hypothesis: There is a better than even chance that 'Bernhard is a frog and Emily is a sheep'.
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
    0.7::factA.
    0.1::factB.
    0.7::factC.
    
  
    %hop2
    conclusion:-and(factB,factA).
  
    query(conclusion).
    
hypothesis_assertion: 'Bernhard is a frog and Emily is a sheep'.