#!/usr/bin/env python
#coding:utf-8
SET_START = 1
SET_END = 9
SUB_LEN = 10
def r_subset(i, r, pre, array, sub):
if i == r:
print sub
return
j = pre
len_ = len(array) - (r - i)
while j <= len_:
sub[i] = array[j]
r_subset(i+1, r, j+1, array, sub)
j += 1
if __name__ == "__main__":
array = xrange(SET_START, SET_END)
i = 0
r = SUB_LEN
sub = [0 for _ in xrange(r)]
r_subset(i, r, 0, array, sub)
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