from sys import stdin
input = stdin.readline

def func(limit):
    dp = [0]*10
    MAX = -1
    for i in range(18):
        n = limit//(10**(17-i))%10
        ndp = [0]*10
        for j in range(10):
            if dp[j] == 0: continue
            for k in range(10):
                ndp[max(j, k)] += dp[j]
        for j in range(n):
            ndp[max(MAX, j)] += 1
        MAX = max(MAX, n)
        dp = ndp
    ans = MAX
    for i in range(10):
        ans += dp[i]*i
    return ans

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

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