Nos Galan Gaeaf gall fod yn hwyl iawn, os bydd cais da. Allwch chi feddwl am yr holl y prawf go iawn, er enghraifft, i osod pob math o lythyrau pwmpenni a'u galluogi i ddod o hyd. Ac efallai wedi dod o hyd i prawf o'r fath i chi? Brysiwch, mae gennych ychydig iawn o amser i gwblhau'r dasg.
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