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 (", ").

Let me give you an 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?.
The answer to this example can be: 1, 2.
Here is why: 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.

OK. solve this:
Paragraph- Sent 1: In 2415 , after a virus in 2011 wiped out 99 % of the Earth 's population , all of the survivors inhabit Bregna , a walled city-state , which is ruled by a congress of scientists .
Sent 2: Although Bregna is idyllic , people are routinely disappearing and everyone is suffering from bad dreams .
Sent 3: on Flux is a member of the ` Monicans ' , an underground rebel organization who communicate through telepathy-enabling technology and are led by The Handler .
Sent 4: After a mission to destroy a surveillance station , on comes home to find her sister Una has been killed for being mistaken for a Monican .
Sent 5: When on is sent on a mission to kill the government 's leader , Trevor Goodchild , she discovers that both she and the Monicans are being manipulated by council members in a secret coup .
Sent 6: This discovery causes on to question the origins of everyone in Bregna ; and in particular , her own personal connection to Trevor .
Sent 7: It turns out that everyone in Bregna is actually a clone , grown from recycled DNA .
Sent 8: With the dead constantly being reborn into new individuals and still bearing partial memories of their previous lives , there has been an increase in the troubling dreams .
Sent 9: Recycling and cloning became necessary since the original viral antidote made humans infertile .
Sent 10: Trevor 's ongoing experiments , as with all his clone ancestors , has been trying to reverse the infertility .
Sent 11: on learns that she is a clone of the original Trevor 's wife , Katherine and is the first Katherine clone in over 400 years .
Sent 12: One of Trevor 's experiments , Una , was successful as she became pregnant . 
Question: which discovery causes on to question the origins of everyone in Bregna?.
Answer:
5, 6.