Detailed Instructions: 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: I've been thinking about the mindwipe, now two days away.
Sent 2: Who said that those who forget the past are doomed to repeat it?
Sent 3: I fear that may be true for me.
Sent 4: Add this to the reasons I write now: to remember something, perhaps even to learn -- Emil Malaquez arrived after sundown, carrying a small package wrapped in what looked like real paper.
Sent 5: His evening dress was formal, expensive, and slightly stained, as that of all forgetful artists should be.
Sent 6: He was a jovial man with an easy laugh, and even uglier than Tasha had suggested.
Sent 7: I liked him immediately.
Sent 8: "Señor Malaquez?"Sent 9: "Please.
Sent 10: Call me Emil.
Sent 11: You must be Bernardo.
Sent 12: Tasha's told me much about you."Sent 13: "All of it outrageous praise?"Sent 14: "All of it."Sent 15: "Ah, she is wonderfully perceptive."Sent 16: He raised an eyebrow, then guffawed.
Sent 17: "Has she said as much about me?"Sent 18: "She thinks you are a genius.
Sent 19: Do come in."Sent 20: "Thank you.". 
Question: Whose evening dress was formal?.
Solution:
4, 5.