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Llinell 7:
== Dolennau allanol ==
* {{eicon en}} [http://www.iupac.org/goldbook/S06121.pdf IUPAC diffiniad (ar ffurf feil pdf)] {{Webarchive|url=https://web.archive.org/web/20080905113250/http://www.iupac.org/goldbook/S06121.pdf |date=2008-09-05 }}
== Gweler hefyd ==
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