context: We believe that Lily is green. It is highly unlikely that Greg is a frog. Chances are about even that Bernhard is a rhino. We doubt that if either 'Greg is a frog' or 'Lily is green' but not both then Sumit is thirsty. It is highly unlikely that if 'Bernhard is a rhino and Lily is green' then Jason is tired. It is highly unlikely that if either 'Lily is green' or 'Bernhard is a rhino' but not both then Mary left the football.
hypothesis: It is highly likely that 'Sumit is thirsty and Bernhard is a rhino'.
valid_hypothesis: It is highly unlikely that 'Sumit is thirsty and Bernhard is a rhino'.
invalid_hypothesis: It is highly likely that 'Sumit is thirsty and Bernhard is a rhino'.
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.
    0.5::factC.
    %hop1
    0.2::factX:-xor(factB,factA).
    0.05::factY:-and(factC,factA).
    0.05::factZ:-xor(factA,factC).
  
    %hop2
    conclusion:-and(factX,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Sumit is thirsty and Bernhard is a rhino'.