TASK DEFINITION: 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 (", ").
PROBLEM: Paragraph- Sent 1: Have you ever felt a shock?
Sent 2: Maybe you had just walked across the carpet and touched something metal?
Sent 3: How is this similar to lightning?
Sent 4: Believe it or not, they are very similar.
Sent 5: They are both discharges of static electricity.
Sent 6: Lightning is static electricity on a grand scale.
Sent 7: Lightning discharges a lot of electric charge.
Sent 8: It happens all at once.
Sent 9: Unfortunately, this large discharge is not useful.
Sent 10: It is so large and so fast, it cannot be controlled.
Sent 11: You cant plug a toaster into a lightning bolt!
Sent 12: For most devices, a much smaller amount of electric charge is needed.
Sent 13: It must also be steady.
Sent 14: It cant come all in one big jolt.
Sent 15: Thats why we cant run our homes off of lightning.
Sent 16: Our homes need to have a steady and continuous supply of electric current.
Question: What can happen when you walk across a carpeted floor and touch metal?.

SOLUTION: 1, 2.

PROBLEM: Paragraph- Sent 1: Electric charge is a physical property.
Sent 2: It occurs between particles or objects.
Sent 3: It causes them to attract or repel each other.
Sent 4: They do not even have to touch.
Sent 5: This is unlike the typical push or pull you may be familiar with.
Sent 6: All electric charge is based on the protons and electrons in atoms.
Sent 7: A proton has a positive electric charge.
Sent 8: An electron has a negative electric charge (see Figure below).
Sent 9: Forces on Charged Objects Most atoms are balanced electrically.
Sent 10: They have the same number of positive and negative charges.
Sent 11: Therefore, the number of protons equals the number of electrons.
Sent 12: Neutrons do not matter as they have no charge.
Sent 13: When an object loses some electrons, it becomes positively charged.
Sent 14: There are now more protons than electrons inside the atom.
Sent 15: The lost electrons may remain free.
Sent 16: Or, they may attach to another object.
Sent 17: The new object now has more electrons than protons.
Sent 18: It then becomes negatively charged.
Question: How will increasing neutrons affect the particles charge?.

SOLUTION: 6, 12.

PROBLEM: Paragraph- Sent 1: (CNN) -- Champion cyclist Lance Armstrong said Wednesday the U.S. Anti-Doping Agency intends to "dredge up discredited" doping allegations against him in a bid to strip him of his seven Tour de France victories.
Sent 2: The Washington Post said it received a copy of a 15-page agency letter sent Tuesday to Armstrong and several others.
Sent 3: As a result of the allegations, Armstrong was immediately banned from competing in triathlons, a sport he took up after retiring from professional bicycling, the newspaper reported on its website.
Sent 4: Armstrong, as he has in the past, said he has never engaged in doping.
Sent 5: "Unlike many of my accusers, I have competed as an endurance athlete for 25 years with no spike in performance, passed more than 500 drug tests and never failed one," Armstrong said on his website.
Sent 6: "That USADA ignores this fundamental distinction and charges me instead of the admitted dopers says far more about USADA, its lack of fairness and this vendetta than it does about my guilt or innocence."Sent 7: Justice Department prosecutors in February said they closed a criminal investigation after reviewing allegations against Armstrong.
Sent 8: They had called witnesses to a federal grand jury in Los Angeles, but they apparently determined they lacked evidence to bring a charge that Armstrong used performance-enhancing drugs.
Sent 9: Armstrong was accused of using such drugs by other riders, but never failed a drug test.
Sent 10: "These are the very same charges and the same witnesses that the Justice Department chose not to pursue after a two-year investigation," Armstrong said Wednesday.
Sent 11: According to the Post, the U.S. Anti-Doping Agency alleged it collected blood samples from Armstrong in 2009 and 2010 that were "fully consistent with blood manipulation including EPO use and/or blood transfusions."Sent 12: The allegations were previously unpublicized, according to the Post.
Sent 13: Opinion: Why fans shouldn't forgive Armstrong The letter says Armstrong and five former cycling team associates engaged in a doping conspiracy from 1998 to 2011, the Post reported.
Sent 14: Riders will testify that Armstrong used EPO, blood transfusions, testosterone and masking agents, and that he distributed and administered drugs to other cyclists from 1998 to 2005, the Post quoted the letter as saying.
Question: What are the two areas of competition in sports, has Lance particiapted in?.

SOLUTION:
3, 5.