#include<bits/stdc++.h>
#define int long long
#define fr(i,j,k) for(register int i=j;i<=k;++i)
#define rf(i,j,k) for(register int i=j;i>=k;--i)
#define foredge(i,j) for(register int i=head[j];i;i=e[i].nxt)
#define randfind(l,r) (rand()%((r)-(l)+1)+(l))
#define pb push_back
#define Times printf("Time:%.3lf\n",clock()/CLOCKS_PER_SEC)
using namespace std;
inline int read(){
	int x=0;
	bool f=0;
	char c=getchar();
	while(!isdigit(c)) f|=(c=='-'),c=getchar();
	while(isdigit(c)) x=(x<<3)+(x<<1)+(c^48),c=getchar();
	return f?-x:x;
}
inline void write(int x){
    if(x<0){putchar('-');x=-x;}
    if(x>9)write(x/10);
    putchar(x%10+'0');
}
inline void writeln(int x){write(x); puts("");}
inline void writepl(int x){write(x); putchar(' ');}
//inline void init(){
//	int t=read();
//	while(t--) work();
//}
const int Maxn=1e2+10;
int a[Maxn],b[Maxn];
int n;
int vis[Maxn];
struct node{
    int val;
    int id;
}e[Maxn];
int sum[Maxn];
inline bool cmp(node a,node b){return a.val<b.val;}
inline bool check(int x){
    memset(vis,0,sizeof(vis));memset(sum,0,sizeof(sum));
    vis[n]=1;
    int l=1;
    fr(i,1,n){
        if(i==x){sum[i]=a[i]+b[n];continue;}
        while(vis[e[l].id]) ++l;
        int flag=0;
        fr(j,l,n){
            // writepl(i),writepl(j),writepl(e[j].id);
            // puts("");
            if(vis[e[j].id]) continue;
            if(e[j].id==i) continue;
            // puts("**");
            if(e[j].val+a[i]>=sum[i-1]){
                flag=1;vis[e[j].id]=1;
                break;
            }
        }
        if(!flag) return false;
    }
    return true;
}
inline void work(){
    n=read();
    fr(i,1,n) a[i]=read(),b[i]=read();
    fr(i,1,n) e[i].id=i,e[i].val=b[i];
    sort(e+1,e+n+1,cmp);
    // fr(i,1,n) writepl(e[i].val),writeln(e[i].id);
    fr(i,1,n-1) if(check(i)){
        puts("Yes");
        return;
    }
    puts("No");
}
inline void init(){
    int t=read();
    while(t--) work();
}
signed main(){
	// freopen("input.in","r",stdin);
	// freopen("output.out","w",stdout);
    init();
    // printf("\nTIME:%.3lf",(double)clock()/CLOCKS_PER_SEC);
	return 0;
}