Definition: In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.
Input: # 99:  Usual procedure ?
Chief: Naturally , three copies of the report .
# 99: File the master copy and burn the other _ two _ .
Chief: Of course .
# 99: Chief , I 've been meaning to ask you about that . Why do we bother making extra copies when all we do is destroy them ?
Chief: That 's security procedure , 99 .
# 99: Does n't it strike you as being a little odd ?
Chief: Well , I used to think so too , but well it 's all carefully explained in the Control Standard Procedure Handbook .
# 99: Oh , may I have a look at that handbook some time ?
Chief: No , I 'm afraid not , 99 .
# 99: Why not ?
Chief: We burned it .

copies