You are given a paragraph, with numbered sentences, and a question. Write the numbers of the sentences needed to answer the given question. Separate multiple sentence numbers with a comma (", "). E.g. "1, 2" would be the correct response if Sent 1 and Sent 2 are needed to answer the given question (do not include sentences that contain no information that is necessary to answer the question). Sort the sentence numbers in an increasing order (i.e., '1, 2', instead of '2, 1'). Your answer should not contain anything than the sentence numbers separated by a comma (e.g. '1, 2, 3, 4'). The given question requires more than one sentence to answer. So, your answer must contain at least one comma (", ").

[Q]: Paragraph- Sent 1: Magnets are able to cause a change.
Sent 2: They are able to make some other objects move.
Sent 3: They do this by creating a force.
Sent 4: This force is called a magnetic force.
Sent 5: There are different types of forces.
Sent 6: Some forces require objects to touch.
Sent 7: For example, you push a book across a table.
Sent 8: You are touching the book as it moves.
Sent 9: Think back on the levitating train.
Sent 10: It wasnt touching the track.
Sent 11: How could it move?
Sent 12: Magnets too can produce change.
Sent 13: They can produce motion just like you do.
Sent 14: Unlike you, magnets do not need to touch the other object.
Sent 15: Thats right, there is a force without making contact.
Sent 16: A magnetic force does not require objects to touch.
Sent 17: A magnet can push or pull certain items without ever touching them.
Sent 18: Thats how the maglev train works.
Question: Can pushing a book across a table be considered a force?.
[A]: 6, 7, 8.

[Q]: Paragraph- Sent 1: You couldnt survive without your skin.
Sent 2: It has many important functions.
Sent 3: The main function of the skin is controlling what enters and leaves the body.
Sent 4: It prevents the loss of too much water from the body.
Sent 5: It also prevents bacteria and other microorganisms from entering the body.
Sent 6: The skin helps maintain a constant body temperature.
Sent 7: It keeps the body cool in two ways.
Sent 8: Sweat from sweat glands in the skin evaporates to cool the body.
Sent 9: Blood vessels in the skin dilate, or widen.
Sent 10: This action increases blood flow to the body surface.
Sent 11: This allows more heat to reach the surface.
Sent 12: The heat is then able to radiate off the body.
Sent 13: The opposite happens to retain body heat.
Sent 14: Blood vessels in the skin constrict, or narrow.
Sent 15: This decreases blood flow to the body surface.
Sent 16: This reduces the amount of heat that reaches the surface.
Sent 17: When this happens, less heat can be lost to the air.
Question: What happens when heat reaches the surface of your skin?.
[A]: 11, 12.

[Q]: Paragraph- Sent 1: Dick was enraged to see how contentedly the men bore the irksome confinement, the meager food, and harsh peremptoriness of the beardless boys set over them as guards.
Sent 2: Most of the prisoners passed the time in cards, playing for buttons, trinkets, or what not that formed their scanty possessions.
Sent 3: Dick learned that all the commissioned officers of the company with Wesley Boone had been wounded or killed in the charge near the stone bridge.
Sent 4: Wesley had been with the prisoners at first.
Sent 5: He had been struck on the head, and was in a raging fever when his father and sister came to the prison to take him away.
Sent 6: No one could tell where he was now, but Dick knew that he must be in the city, since there were no exchanges, the Confederates allowing no one to leave the lines except women with the dead, or those who came from the North on special permits.
Sent 7: Then he visited the provost headquarters, and was shown the complete list of names recorded in the books there; but Barney's was not among them.
Sent 8: At the Spottswood Hotel, the day after his coming, he met Elisha Boone, haggard, depressed, almost despairing.
Sent 9: Dick had no love for the hard-headed plutocrat, but he couldn't resist making himself known.
Question: Why is Elisha Boone "haggard, depressed, almost despairing".
[A]:
3, 4, 5, 6, 8.