from sys import stdin
input = stdin.readline

def func(limit):
    dp = [[[0]*10 for _ in range(2)] for _ in range(19)]
    dp[0][0][0] = 1
    for i in range(18):
        n = limit//(10**(17-i))%10
        for small in range(2):
            for j in range(10):
                if dp[i][small][j] == 0: continue
                for k in range(10 if small else n+1):
                    dp[i+1][small or k < n][max(j, k)] += dp[i][small][j]
    ans = 0
    for i in range(2):
        for j in range(10):
            ans += dp[-1][i][j]*j
    return ans

for _ in range(int(input())):
    L, R = map(int, input().split())

    print(func(R)-func(L-1))