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Sut i wneud yr ymchwiliad d诺r
Os oedd eich dosbarth am wneud sgwariau i芒 neu lolipops i芒 yn gyflym, a fyddai鈥檔 well defnyddio d诺r oer neu dd诺r cynnes? Pa un fyddai鈥檔 rhewi gyflymaf?
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