import sys
# input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################

m = 10
def f(n):
    dp = [0] * (2 * m)
    N = [int(x) for x in str(n)]
    nn = len(N)

    dp[0] = 1
    for i in range(nn):
        ndp = [0] * (2 * m)
        dp, ndp = ndp, dp
        for j in range(m):
            for k in range(2):
                for x in range(m):
                    nk = k
                    nj = max(j, x)
                    if k == 0 and N[i] < x:
                        continue
                    if N[i] > x:
                        nk = 1
                    dp[nj * 2 + nk] += ndp[j * 2 + k]
    
    ans = 0
    for i in range(m):
        for j in range(2):
            ans += i * dp[i * 2 + j]
    return ans

for _ in range(ni()):
    l, r = na()
    l -= 1
    print(f(r) - f(l))