#include "stdio.h"

#define get getchar_unlocked

inline long int scan2(){

long int n=0,s=1;

char p=get();

if(p=='-') s=-1;

while((p<'0'||p>'9')&&p!=EOF&&p!='-') p=get();

if(p=='-') s=-1,p=get();

while(p>='0'&&p<='9') { n = (n<< 3) + (n<< 1) + (p - '0'); p=get(); }

return n*s;

}

int main(){

long int t = 0,x = 0,y = 0,v = 0,f1 = 0,f2 =0,f3 = 0;

t = scan2();

while(t--){

v = scan2();

while(v--){

x = scan2();

y = scan2();

if(x == y)

f1 = 1;

else if(x < y)

f2 = 1;

else

f3 = 1;

}

if(f1 || (f2 && f3))

printf("YES\n");

else

printf("NO\n");

f1 = 0;

f2 = 0;

f3 = 0;

}

return 0;

}