#include <bits/stdc++.h>
using namespace std;
 
#define int long long
void solve(){
	int n,k,a,b;
	cin>>n>>k>>a>>b;
	--k;
	--a,--b;
	vector<pair<int,int>> v(n);
	for(int i=0;i<n;i++){
		int x,y;
		cin>>x>>y;
		v[i]={x,y};
	}
	int d=1e9;
	int x1=v[a].first,y1=v[a].second;
	int x2=v[b].first,y2=v[b].second;
	if(k<0){
		cout<<abs(x1-x2)+abs(y1-y2)<<endl;
		return ;
	}
	if(a>k && b<=k){
		for(int i=0;i<=k;i++){
			d=min(d,abs(x1-v[i].first)+abs(y1-v[i].second));
		}
	}
	if(a<=k && b>k){
		for(int i=0;i<=k;i++){
			d=min(d,abs(x2-v[i].first)+abs(y2-v[i].second));
		}
	}
	if(a>k && b>k){
		for(int i=0;i<=k;i++){
			d=min(d,abs(x1-v[i].first)+abs(y1-v[i].second));
		}
		int d2=INT_MAX;
		for(int i=0;i<=k;i++){
			d2=min(d2,abs(x2-v[i].first)+abs(y2-v[i].second));
		}
		d+=d2;
	}
	if(d==1e9){
		cout<<0<<endl;
	}
	else{
		cout<<d<<endl;	
	}
 
 
 
}
signed main() {
	// your code goes here
	int t;
	cin>>t;
	while(t--){
		solve();
	}
	return 0;
}

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1
11 6 8 10
-11 76
-1 -63
-5 -75
58 75
68 21
87 65
-32 63
66 -31
-53 84
88 -7
84 -73