context: There is a very good chance that Emily is a wolf. It is almost certain that Sandra dropped the apple. It is likely that Brian is a lion. There is a better than even chance that if either 'Emily is a wolf' or 'Brian is a lion' but not both then Lily is yellow. It is highly likely that if 'Sandra dropped the apple and Brian is a lion' then Bernhard is green. It is probably not the case that if 'Sandra dropped the apple and Emily is a wolf' then Mary left the football.
hypothesis: There is a better than even chance that 'Emily is a wolf and Brian is a lion'.
valid_hypothesis: There is a better than even chance that 'Emily is a wolf and Brian is a lion'.
invalid_hypothesis: It is highly unlikely that 'Emily is a wolf and Brian is a lion'.
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
    0.8::factA.
    0.95::factB.
    0.7::factC.
    %hop1
    0.6::factX:-xor(factA,factC).
    0.9::factY:-and(factB,factC).
    0.25::factZ:-and(factB,factA).
  
    %hop2
    conclusion:-and(factA,factC).
  
    query(conclusion).
    
hypothesis_assertion: 'Emily is a wolf and Brian is a lion'.