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The OP was not referring to "some collisions"; his app
collapsed all entries to a single hash value.  Changing XOR
to + would partially eliminate the self cancelling property
of this hash function. 

Also, I am concerned about the tuple hash using the same
multiplier as the hash for other objects. In sets.py, a
naive combination of the component hash values caused many
distinct sets to collapse to a handful of possibilities --
while tuples do not have an identical issue, it does
highlight the risks involved.