Print Increasing Sequences Recursive MEDIUM Recursion 25 XP 0 solved
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Problem

Given two integers N and K (1 ≤ K ≤ N ≤ 9), print all increasing sequences of length K from numbers 1 to N, one per line (space-separated).

Input format

Input input.txt

- Two integers N and K

Output format

Output output.txt

- Each sequence, one per line

Example

input
4 2
output
1 2
1 3
1 4
2 3
2 4
3 4

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