plz help..convert it into past tense1. Do not use very small glass tubes i.e. less than 20 cm. 2. Keep rotating the tube while heating. 3. Do not bend by force, only bend hot softened tube gently 4. Do not place hot tube on table
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1. Very small glass tubes less than 20 cm should not be used.
2.The tube should be rotated while heating.
3.Hot softened tube should be bent gently. And not to be bent by force.
4.Hot tube should not be placed on the table.
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