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What do you mean by 9 roots and 8 species? Mathematical problems.
meaning

There are many ways to divide nine sticks into two piles. One stick plus eight sticks is the first method. Two sticks and seven sticks are the second method. Three sticks and six sticks is the third method. Four sticks and five sticks are the fourth division. To sum up, nine sticks are divided into two parts * * * and there are four ways to divide them, all of which are acceptable.