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Pennod 16
Wyth disgybl disglair sy'n cystadlu mewn pedair tasg anodd ond dim ond un cystadleuydd fydd 芒'r cyfle i ateb yr un cwestiwn. Eight bright students will compete in four challenging tasks...
Darllediad diwethaf
Maw 10 Awst 2021
17:35