Table tennis elimination tournament, five units, five players in each unit. How to draw lots for single elimination? No seed players are required, just try to be fair.

The rules of table tennis international competition stipulate that "the number of eliminated places in the first round should be a power of 2".

So this round robin can only use the fifth power of 2, which is 32 positions.

Bypass method:

25 people, 32 positions, and 7 positions are vacant.

① Number 32 bits according to 1~32, and take out 7 blank numbers. The remaining 25 numbers were drawn by 25 athletes.

Note: The number of spaces should be evenly distributed in the upper and lower parts, where 1~ 16 is the upper part and 17~32 is the lower part. Therefore, there are seven numbers: 2,5, 12, 15,18,21,3 1.

② Pairing of 32 numbers with single and double numbers. In this way, the empty pairs are 1, 6, 1 1, 16, 17, 22, 32, and their first round is bye.

So the first round is 32 16, followed by 16 into 8, 8 into 4, 4 into 2, the champion.