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What are the odd and even numbers of stairs?
Odd and even stairs correspond to floors.
If the building height is 5, 7, 9 and other odd floors, then the zigzag stairs are odd;
The building height is 6, 8, 10 and other even floors, so the zigzag staircase is even.
In a word, the sum of stairs is always even, because from the beginning of climbing stairs, it has an impact on people's joints and heart. If it is odd, it will lead to uneven people going up the stairs.