<https://www.17thshard.com/forums/topic/22034-shards/#comment-210597>
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"I've often times wondered this myself.  So much emphasis is put on the various metals always being paired in allomancy...and there are 16...I always suspected that there may be some of the same thing going on with the shards.  However...the WoB listed above kind of trounces the idea that all shards have a paired opposite or counterpart.  Bummer... "
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