Olympiad

You are one of the competitors of the Olympiad in numbers. The problem of this year relates to beatiful numbers. One integer is called beautiful if and only if all of its digitals are different (i.e. 12345 is beautiful, 11 is not beautiful and 100 is not beautiful). Every time you are asked to count how many beautiful numbers there are in the interval $[a,b]\ (a \le b)$. Please be fast to get the gold medal!

The first line of the input is a single integer $T\ (T \le 1000)$, indicating the number of testcases.

For each test case, there are two numbers $a$ and $b$, as described in the statement. It is guaranteed that $1 \le a \le b \le 100000$.

For each testcase, print one line indicating the answer.

2
1 10
1 1000

10
738

XJZX

2015 Multi-University Training Contest 4