#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")

char*mmap();
#define rd_skip() while(*rp++>=48)
#define rd(v) int v=0;{int _c;while(_c=*rp++-48,_c>=0)v=v*10+_c;}

char wbuf[1<<25];

#define WTHI(v) {long _z=v,_n=0,_d=0;while(++_n,_d=_d<<8|0x30|_z%10,_z/=10);*(long*)wp=_d;wp+=_n;}
#define WTLO(v) {long _z=v,_n=8,_d=0;while(_d=_d<<8|0x30|_z%10,_z/=10,--_n);*(long*)wp=_d;wp+=8;}
#define wt(v) if(v>=100000000){WTHI(v/100000000);WTLO(v);}else{WTHI(v);}

#define MD 1000000007
#define M 400001
int fac[M],ifac[M];

int inverse(int a){
	int b=MD;
	int u=1;
	int v=0;
	int s,t;
	while(b){
		t=a/b;
		s=b; b=a-t*b; a=s;
		s=v; v=u-t*v; u=s;
	}
	if(u<0){
		u+=MD;
	}
	return u;
}

void mkfac(){
	fac[0]=1;
	for(int i=1;i<M;i++){
		fac[i]=(long)fac[i-1]*i%MD;
	}
	ifac[M-1]=inverse(fac[M-1]);
	for(int i=M;--i;){
		ifac[i-1]=(long)ifac[i]*i%MD;
	}
}

main(){
	mkfac();

	char*rp=mmap(0l,1l<<25,1,2,0,0ll);
	char*wp=wbuf;
	
	rd_skip();
	while(*rp){
		rd(h);
		rd(w);
		long r=(long)fac[h+w-4]*ifac[h-2]%MD*ifac[w-2]%MD*(2*(h+w-3))%MD;
		wt(r);
		*wp++=10;
	}
	write(1,wbuf,wp-wbuf);
	_exit(0);
}