A pharmacist has one 5 ml container and one 3 ml container. How can he measure exactly 1 ml of medicine without wasting any medicine?

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Answer: First, the pharmacist fills in the 3 ml container and empties the content of it into 5 ml container. Then he fills in the 3 ml container again and pours the medicine from this container into the 5 ml container until it is full. The medicine remaining in the 3 ml container is exactly 1 ml.

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