Logged In: YES 
user_id=764593

Note that in this case, the problem was because of nested 
tuples.  X was the first element of both tuples, and both 
tuples had the same length -- so the X's would still have been 
multiplied by the same constant.  (Not the same constant as 
Y, and hash(X, Y), but the same constant as each other.)  A 
non-linear function might work, but would do bad things to 
other data.