#define MD 100000007

int h,w,k;
int a[20],b[20];
mint c[1<<20];

{
	combination_mint cm;
	cm.init(2d5);
	
	rd(h,w,k,(a,b)(k));
	rep(i,1<<k){
		mint r;
		vector<pair<int,int>> v;
		rep(j,k){
			if(i&1<<j){
				v.push_back(make_pair(a[j],b[j]));
			}
		}
		sort(v.begin(),v.end());
		v.push_back(make_pair(h,w));
		r=__builtin_parity(i)?MD-1:1;
		auto p=make_pair(0,0);
		for(auto q:v){
			int y,x;
			y=q.first-p.first;
			x=q.second-p.second;
			r*=x<0?mint(0):cm.C(y+x,y);
			p=q;
		}
		rep(j,i){
			if((j&i)==j){
				r+=(__builtin_parity(i^j)?c[j]:-c[j]);
			}
		}
		c[i]=r;
		wt(r);
	}
}