context: It is almost certain that Greg is a frog. We believe that Mary left the football. It is probably the case that Daniel dropped the apple. There is a better than even chance that if 'Daniel dropped the apple' or 'Greg is a frog' or both then Emily is a mouse. It is highly unlikely that if 'Daniel dropped the apple' or 'Greg is a frog' or both then Julius is a rhino. It is probably not the case that if 'Mary left the football' or 'Greg is a frog' or both then John went to the hallway.
hypothesis: There is almost no chance that 'Julius is a rhino and Emily is a mouse'.
valid_hypothesis: There is almost no chance that 'Julius is a rhino and Emily is a mouse'.
invalid_hypothesis: It is probably the case that 'Julius is a rhino and Emily is a mouse'.
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
    0.95::factA.
    0.75::factB.
    0.7::factC.
    %hop1
    0.6::factX:-or(factC,factA).
    0.05::factY:-or(factC,factA).
    0.25::factZ:-or(factB,factA).
  
    %hop2
    conclusion:-and(factY,factX).
  
    query(conclusion).
    
hypothesis_assertion: 'Julius is a rhino and Emily is a mouse'.