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Dewis pwnc arall neu clirio pob hidlydd.
Nid yw holl gynnwys y cyfrifia wedi'i ryddhau. Edrychwch am ddatganiadau sydd i ddod ar y calendr datganiadau. Fel arall, gallwch greu set ddata eich fun.
Rhyddhawyd ar: 26 January 2024 | Gwybodaeth gorfforaethol
To begin the study, please scroll down and press the green "Start now" button, then enter your username and password.
Rhyddhawyd ar: 25 April 2023 | Gwybodaeth gorfforaethol
Ця сторінка також доступна українською. This page is available in Ukrainian. To begin the study, please click "Start now", then enter your personal access code.
Rhyddhawyd ar: 27 February 2023 | Gwybodaeth gorfforaethol
Ця сторінка також доступна українською. This page is available in Ukrainian. To begin the survey, please click "Start now", then enter your personal access code.
Rhyddhawyd ar: 26 March 2024 | Gwybodaeth gorfforaethol
