Is either carbon or silicon present in every known polymer?

If not, is there a small group of elements that, between them, are present in every known polymer, or can polymers be based on a lot of different elements?

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    $\begingroup$ Not all and answer may depend on what you'd call a polymer. $\endgroup$ – Mithoron Mar 25 '19 at 23:36

No, neither C nor Si have to be present in a polymer. IUPAC defines polymer simply as

A substance composed of macromolecules.

In turn, there is no limitations on the elements the macromolecules may consist of. In fact, there is an extensive class of inorganic polymers free of carbon and silicon.

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