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Lois: Here, take a look at those crime-scene photos.
Clark: But there's a stamp on each of the victims' hands.
I only saw a few dots. Must have been some sort of relief pattern. Just a fraction
of the whole stamp?

It matches the stamp right there.
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MadhulkMust have been some sort of relief pattern.
I agree that we're talking about a "partial,"

but, "relief" here has a different meaning, as in bas-relief.

It's the kind of raised dot pattern recognized in Braille.
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Suddenly it looks much more clear now.
Thanks, Avangi!