#include <bits/stdc++.h>
using namespace std;

int main()
{
    int testcase;

    cin >> testcase;

    while (testcase--)
    {
        long long int a, b, temp, count = 0;
        bool flag = false;

        cin >> a >> b;

        if (a == b)
        {
            cout << 0;
        }
        else if (a > b)
        {
            if (a % b == 0)
            {
                temp = a / b;

                while (temp != 0)
                {

                    if (temp % 2 == 0)
                    {
                        temp = temp / 2;
                        count++;
                    }

                    else if (temp == 1)
                    {
                        //count++;
                        break;
                    }
                    else
                    {
                        cout << -1;
                        flag = true;
                        break;
                    }
                }

                int temp1 = count % 3;
                int temp2 = temp1 % 2;
                int result = count / 3 + temp1 / 2 + temp2;
                if(flag == false)
                {
                    cout << result;
                }
            }
            else
            {
                cout << -1;
            }
        }
        else if (a < b)
        {
            if (b % a == 0)
            {
                temp = b / a;

                while (temp != 0)
                {

                    if (temp % 2 == 0)
                    {
                        temp = temp / 2;
                        count++;
                    }

                    else if (temp == 1)
                    {
                        //count++;
                        break;
                    }
                    else
                    {
                        cout << -1;
                        flag = true;
                        break;
                    }
                }

                int temp1 = count % 3;
                int temp2 = temp1 % 2;
                int result = count / 3 + temp1 / 2 + temp2;
                if (flag == false)
                    cout << result;
            }
            else
            {
                cout << -1;
            }
        }
        cout << endl;
    }
}