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# 『入门』（递归专题）排列生成（不可重用）
[问题描述]
教学案例，必须使用递归函数完成求解！
从1至n（ n <= 9 ）这些数字中，任意选取m个数字，可以组成一个m位数，请将所有可能生成的m位数按由小到大的次序输出，每行一个。（注：数字不可以重复使用！）