Give you many positive integer N (N<=23), for each N, just output N*(N+1)/2 integers in a single line, separated by space. (Don't ask me why.) For each N, the output line contains integers from 1 to N, and each just once. Again, do not ask me why, thank you. I'm so busy. But I can tell you a secret, the output has relationship with number triangle. As:(N=3)

                   1

                   2   6

                   3   4   5

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a positive integer N (N<=23). 

For each N, output N*(N+1)/2 integers in a single line, separated by a blank space.