There is a mathematician who is very worried about his safety. Every time I take the plane, he will always carry a bomb with you. Because he found that there is a possibility of a bomb on the plane, there are two bombs may be much smaller.
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There is a project manager, he is very worried about the project extension. Every time he received a 6-month project, he will always tell the programmer's last deadline for 3 months. Because he found that if the project may be postponed for 2 months, it seems to be a little less than 5 months.
