/*
* CRAN01.cpp
*
* Created on: Jun 10, 2014
* Author: Arpit Bhayani
*/
#include <cstdio>
#include <cstdlib>
#include <iostream>
using namespace std;
#define DEBUG 0
#define gc getchar
#define ll long long
void scanint(ll int &x) {
register ll int c = gc();
x = 0;
for (; (c < 48 || c > 57); c = gc())
;
for (; c > 47 && c < 58; c = gc()) {
x = (x << 1) + (x << 3) + c - 48;
}
}
int readline(char * str) {
int i = 0;
char ch;
while ((ch = getchar()) != '\n') {
str[i++] = ch;
}
str[i] = '\0';
return i;
}
int main(int argc, char * argv[]) {
int t;
scanf("%d", &t);
while (t--) {
int n, m;
int a, b;
scanf("%d%d", &n, &m);
scanf("%d%d", &a, &b);
int t1, t2, t3, t4;
t1 = abs(a - 1) + abs(b - 1);
t2 = abs(a - 1) + abs(m - b);
t3 = abs(m - b) + abs(n - a);
t4 = abs(b - 1) + abs(n - a);
printf("%d\n", max(t1, max(t2, max(t3, t4))));
}
return 0;
}
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