user: 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 (", ").
Example: Paragraph- Sent 1: A Republican bid to keep the government open past Friday includes no new money for the construction of a border wall along the U.S.-Mexico border, according to several congressional aides familiar with ongoing talks.
Sent 2: GOP leaders submitted the new offer Tuesday afternoon in an effort to appease Democrats, whose votes are needed to avert a shutdown of federal agencies, several House and Senate aides said.
Sent 3: However, Republicans also insisted on increases in border security and defense spending, including money to repair existing fencing and new surveillance technology to patrol the nearly 2,000-mile border.
Sent 4: Democrats have indicated that they would support such appropriations so long as no money goes toward an actual wall.
Question: Who has to be appeased to keep the government open?.
Example solution: 1, 2.
Example explanation: The question is: Who has to be appeased to keep the government open? The phrase "appease Democrats" is mentioned in Sent 2, about accepting offer that is mentioned in Sent 1 to "keep the government open". So, Sent 1 and Sent 2 are the sentences needed to answer this question.

Problem: Paragraph- Sent 1: Alexander began his reign by eliminating potential rivals to the throne.
Sent 2: He had his cousin, the former Amyntas IV, executed.
Sent 3: He also had two Macedonian princes from the region of Lyncestis killed, but spared a third, Alexander Lyncestes.
Sent 4: Olympias had Cleopatra Eurydice and Europa, her daughter by Philip, burned alive.
Sent 5: When Alexander learned about this, he was furious.
Sent 6: Alexander also ordered the murder of Attalus, who was in command of the advance guard of the army in Asia Minor and Cleopatra's uncle.
Sent 7: Attalus was at that time corresponding with Demosthenes, regarding the possibility of defecting to Athens.
Sent 8: Attalus also had severely insulted Alexander, and following Cleopatra's murder, Alexander may have considered him too dangerous to leave alive.
Sent 9: Alexander spared Arrhidaeus, who was by all accounts mentally disabled, possibly as a result of poisoning by Olympias.
Sent 10: News of Philip's death roused many states into revolt, including Thebes, Athens, Thessaly, and the Thracian tribes north of Macedon.
Sent 11: When news of the revolts reached Alexander, he responded quickly.
Sent 12: Though advised to use diplomacy, Alexander mustered 3,000 Macedonian cavalry and rode south towards Thessaly.
Sent 13: He found the Thessalian army occupying the pass between Mount Olympus and Mount Ossa, and ordered his men to ride over Mount Ossa.
Sent 14: When the Thessalians awoke the next day, they found Alexander in their rear and promptly surrendered, adding their cavalry to Alexander's force.
Sent 15: He then continued south towards the Peloponnese.
Sent 16: Alexander stopped at Thermopylae, where he was recognized as the leader of the Amphictyonic League before heading south to Corinth.
Sent 17: Athens sued for peace and Alexander pardoned the rebels.
Sent 18: The famous encounter between Alexander and Diogenes the Cynic occurred during Alexander's stay in Corinth. 
Question: What did Alexander learn that made him furious?.


assistant: Solution: 4, 5.