New answers tagged internet
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The following free websites do concordance searches (in Hebrew):
http://www.snopi.com/torasearch/torasearch.asp
http://kodesh.snunit.k12.il/cgi-bin/kodesh/search_adv.pl
I don't know how accurate they are; I generally use Bar Ilan Responsa (link in @Ariel K's answer) or the Even Shoshan Concordance (book, Amazon link.)
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