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Problems

# Locked Treasure

Time limit 1 second
Memory limit 128 MiB

A group of n bandits hid their stolen treasure in a room. The treasure needs to be locked away until there is a need to retrieve it. Since the bandits do not trust each other, they wanted to ensure that at least m of the bandits must agree in order to retrieve the treasure.

They have decided to place multiple locks on the door such that the door can be opened if and only if all the locks are opened. Each lock may have up to n keys, distributed to a subset of the bandits. A group of bandits can open a particular lock if and only if someone in the group has a key to that lock.

Given n and m, how many locks are needed such that if the keys to the locks are distributed to the bandits properly, then every group of bandits of size at least m can open all the locks, and no smaller group of bandits can open all the locks?

For example, if n = 3 and m = 2, only 3 locks are needed - keys to lock 1 can be given to bandits 1 and 2, keys to lock 2 can be given to bandits 1 and 3, and keys to lock 3 can be given to bandits 2 and 3. No single bandit can open all the locks, but any group of 2 bandits can open all the locks. You should also convince yourself that it is not possible to satisfy the requirements with only 2 locks.

## Input data

The first line contains the number of cases to follow. Each case is specified by the two integers n (1n30) and m (1mn) on one line.

## Output data

For each line print on one line the minimum number of locks needed.

## Examples

Input example #1
4
3 2
5 1
10 7
5 3

Output example #1
3
1
210
10

Source 2014 ACM North America - Rocky Mountain, Problem I