#include <bits/stdc++.h>
using namespace std;
inline long long getn() {
  long long sign = 1, num;
  char c;
  c = getchar();
  for (; c < '0' || c > '9'; c = getchar())
    if (c == '-') sign = -1;
  for (num = 0; (c >= '0' && c <= '9'); c = getchar()) num = num * 10 + c - '0';
  return num * sign;
}
signed main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  ;
  long long t;
  cin >> t;
  while (t--) {
    long long x1, y1, x2, y2;
    cin >> x1 >> y1 >> x2 >> y2;
    if (abs(y2 - y1) and abs(x2 - x1))
      cout << (abs(x2 - x1) + 2 + abs(y2 - y1)) << "\n";
    else if (abs(y2 - y1))
      cout << abs(y2 - y1) << "\n";
    else
      cout << abs(x2 - x1) << "\n";
  }
  return 0;
}
