#include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(0);     cin.tie(NULL);     long long t;     cin >> t;     while (t--) {       long long a;       cin >> a;       long long b;       cin >> b;       if (b >= a) {         if (b % a == 0 && pow(2, (long long)log2(b / a)) == b / a) {           if ((long long)(log2(b / a)) % 3 == 0) {             cout << (long long)log2(b / a) / 3 << endl;           } else {             cout << (long long)(1 + (log2(b / a) / 3)) << endl;           }         } else {           cout << -1 << endl;         }       } else {         if (a % b == 0 && pow(2, (long long)log2(a / b)) == a / b) {           if ((long long)(log2(a / b)) % 3 == 0) {             cout << (long long)log2(a / b) / 3 << endl;           } else {             cout << (long long)(1 + (log2(a / b) / 3)) << endl;           }         } else {           cout << -1 << endl;         }       }     }     return 0;   }   