#nullable enable

#region
var (_input, _iter) = (Array.Empty<string>(), 0);
T I<T>() where T : IParsable<T>
{
    while (_iter >= _input.Length) (_input, _iter) = (Console.ReadLine()!.Trim().Split(' '), 0);
    return T.Parse(_input[_iter++], null);
}
#endregion

long F(long x)
{
    var dz = new List<int>();
    while (x > 0)
    {
        var (p, q) = long.DivRem(x, 10);
        dz.Add((int)q);
        x = p;
    }
    dz.Reverse();
    var dp1 = new (long, long)[10];
    var dp2 = new (long, long)[10];
    dp1[0] = (0, 1);
    foreach (var d in dz)
    {
        var ep1 = new (long, long)[10];
        var ep2 = new (long, long)[10];
        for (var i = 0; i < 10; i++)
        {
            var (v, c) = dp1[i];
            for (var j = 0; j < d; j++)
            {
                var m = Math.Max(i, j);
                var (ve, ce) = ep2[m];
                ep2[m] = (ve + c * m, ce + c);
            }
            {
                var m = Math.Max(i, d);
                var (ve, ce) = ep1[m];
                ep1[m] = (ve + c * m, ce + c);
            }
        }
        for (var i = 0; i < 10; i++)
        {
            var (v, c) = dp2[i];
            for (var j = 0; j < 10; j++)
            {
                var m = Math.Max(i, j);
                var (ve, ce) = ep2[m];
                ep2[m] = (ve + c * m, ce + c);
            }
        }
        (dp1, dp2) = (ep1, ep2);
    }
    var res = 0L;
    for (var i = 0; i < 10; i++) res += dp1[i].Item1 + dp2[i].Item1;
    return res;
}

var ans = new List<long>();
var t = I<int>();
for (var j = 0; j < t; j++)
{
    var l = I<long>();
    var r = I<long>();
    ans.Add(F(r) - F(l - 1));
}
Console.WriteLine(string.Join(Environment.NewLine, ans));