def main(n):
    if n == 0: return 0
    m = str(n)
    l = len(m)
    dp = [0 for _ in range(10)]
    a = 0
    for i in range(l):
        ndp = [0] * 10
        for j in range(int(m[i])):
            ndp[max(j, a)] += 1
        for j in range(10):
            for k in range(10):
                ndp[max(j, k)] += dp[k]
        a = max(a, int(m[i]))
        dp = ndp
    dp[a] += 1
    return sum([i*dp[i] for i in range(10)])
    
for _ in range(int(input())):
    l, r = list(map(int, input().split()))
    print(main(r)-main(l-1))