pair<string, string> a[100100], b[100100];
string c[100100];
int p[100100];
string x, y;
int n;

int main()
{
	cin>>n;
	for (int i=0; i<n; i++) {
		cin>>x>>y;
		if (x>y) swap(x, y);
		a[i]=mp(x, y);
	}
	for (int i=0; i<n; i++) scanf("%d", p+i);
	for (int i=0; i<n; i++)
		b[i]=a[p[i]-1];
	c[0]=b[0].F;
	for (int i=1; i<n; i++) {
		if (c[i-1]<b[i].F) {
			c[i]=b[i].F;

		} else
		if (c[i-1]<b[i].S) {
			c[i]=b[i].S;

		} else {
	 	cout<<"NO";
		return 0;
                }
	}
	cout<<"YES";