साँचा:R40
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The chemical-risk Template:R40 generates the redirection title "R40: Limited evidence of a carcinogenic effect" (as the link text for "R40"), which links to article "List of R-phrases" as the description page for all those R-codes. There are dozens of similar R-phrase templates.
Also see: साँचा:tl2 - template to link any rcode.