(Q131810)

Revision as of 09:38, 15 May 2024 by Jason.nlw (talk | contribs) (‎Added [cy] description: menter gydweithredol, sy'n aml yn cynnwys ymchwil neu ddylunio, sydd wedi'i chynllunio'n ofalus i gyflawni nod penodol)

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