package no329;

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.InputMismatchException;
import java.util.NoSuchElementException;
import java.util.Scanner;

public class Main {
	public static final long MOD = 1000000007;
	public static final int WMAX = 1000;
	static long[] fact = Mod.factorialArray(WMAX, MOD);
	static long[][] comb = Mod.combinationArray(1000, 1000, MOD);
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int m = sc.nextInt();
		int[] w = new int[n];
		for(int i=0;i<n;i++) {
			w[i] = sc.nextInt();
		}
		int[][] d = new int[n][n];
		for(int i=0;i<n;i++) {
			d[i][i] = w[i];
		}
		for(int i=0;i<m;i++) {
			int u = sc.nextInt() - 1;
			int v = sc.nextInt() - 1;
			d[u][v] = w[u];
		}
		for(int k=0;k<n;k++) {
			for(int i=0;i<n;i++) {
				for(int j=0;j<n;j++) {
					d[i][j] = Math.max(d[i][j], Math.min(d[i][k], d[k][j]));
				}
			}
		}
//		System.out.println(Arrays.deepToString(d));
		long[][] memo = new long[WMAX+1][WMAX+1];
		long ans = 0;
		for(int i=0;i<n;i++) {
			for(int j=0;j<n;j++) {
				if (d[i][j] >= w[j]) {
					int a = w[i];
					int b = w[j];
					if (a == b) {
						ans += fact[a];
					}else{
						if (memo[a][b] != 0) {
							ans += memo[a][b];
						}else{
							long sum = 0;
							for(int k=0;k<=b;k++) {
								long x = comb[b][k] * Mod.pow(k, a, MOD);
								if ((b - k) % 2 == 0) {
									sum += x;
								}else{
									sum += (MOD - x);
								}
							}
//							System.out.println(i + "," + j + ":" + a + "->" + b + ":" + sum % MOD);
							ans += memo[a][b] = sum;
						}
					}
				}
			}
		}
		System.out.println(ans % MOD);
	}
	
}
class Mod {
	public static long[] factorialArray(int maxN,long mod) {
		long[] fact = new long[maxN+1];
		fact[0] = 1 % mod;
		for(int i=1;i<=maxN;i++) {
			fact[i] = fact[i-1] * i % mod;
		}
		return fact;
	}
	public static long[][] combinationArray(int maxN,int maxR,long mod) {
		long[][] c = new long[maxN+1][maxR+1];
		for(int i=0;i<=maxN;i++) {
			c[i][0] = 1;
			c[i][i] = 1;
		}
		for(int i=1;i<=maxN;i++) {
			for(int j=1;j<=i-1;j++) {
				c[i][j] = c[i-1][j-1] + c[i-1][j];
				if (c[i][j] >= mod) {
					c[i][j] -= mod;
				}
			}
		}
		return c;
	}
	public static long pow(long a,long n,long mod) {
		long res = 1;
		while(n > 0) {
			if ((n & 1) > 0) {
				res = (res * a) % mod;
			}
			a = (a * a) % mod;
			n/=2;
		}
		return res;
	}
}
class IO extends PrintWriter {
	private final InputStream in;
	private final byte[] buffer = new byte[1024];
	private int ptr = 0;
	private int buflen = 0;
	
	public IO() { this(System.in);}
	public IO(InputStream source) { super(System.out); this.in = source;}
	private boolean hasNextByte() {
		if (ptr < buflen) {
			return true;
		}else{
			ptr = 0;
			try {
				buflen = in.read(buffer);
			} catch (IOException e) {
				e.printStackTrace();
			}
			if (buflen <= 0) {
				return false;
			}
		}
		return true;
	}
	private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;}
	private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
	private static boolean isNewLine(int c) { return c == '\n' || c == '\r';}
	public boolean hasNext() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++; return hasNextByte();}
	public boolean hasNextLine() { while(hasNextByte() && isNewLine(buffer[ptr])) ptr++; return hasNextByte();}
	public String next() {
		if (!hasNext()) {
			throw new NoSuchElementException();
		}
		StringBuilder sb = new StringBuilder();
		int b = readByte();
		while(isPrintableChar(b)) {
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}
	public char[] nextCharArray(int len) {
		if (!hasNext()) {
			throw new NoSuchElementException();
		}
		char[] s = new char[len];
		int i = 0;
		int b = readByte();
		while(isPrintableChar(b)) {
			if (i == len) {
				throw new InputMismatchException();
			}
			s[i++] = (char) b;
			b = readByte();
		}
		return s;
	}
	public String nextLine() {
		if (!hasNextLine()) {
			throw new NoSuchElementException();
		}
		StringBuilder sb = new StringBuilder();
		int b = readByte();
		while(!isNewLine(b)) {
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}
	public long nextLong() {
		if (!hasNext()) {
			throw new NoSuchElementException();
		}
		long n = 0;
		boolean minus = false;
		int b = readByte();
		if (b == '-') {
			minus = true;
			b = readByte();
		}
		if (b < '0' || '9' < b) {
			throw new NumberFormatException();
		}
		while(true){
			if ('0' <= b && b <= '9') {
				n *= 10;
				n += b - '0';
			}else if(b == -1 || !isPrintableChar(b)){
				return minus ? -n : n;
			}else{
				throw new NumberFormatException();
			}
			b = readByte();
		}
	}
	public int nextInt() {
		long nl = nextLong();
		if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) {
			throw new NumberFormatException();
		}
		return (int) nl;
	}
	public char nextChar() {
		if (!hasNext()) {
			throw new NoSuchElementException();
		}
		return (char) readByte();
	}
	public double nextDouble() { return Double.parseDouble(next());}
	public int[] nextIntArray(int n) { int[] a = new int[n]; for(int i=0;i<n;i++) a[i] = nextInt(); return a;}
	public long[] nextLongArray(int n) { long[] a = new long[n]; for(int i=0;i<n;i++) a[i] = nextLong(); return a;}
	public double[] nextDoubleArray(int n) { double[] a = new double[n]; for(int i=0;i<n;i++) a[i] = nextDouble(); return a;}
	public void nextIntArrays(int[]... a) { for(int i=0;i<a[0].length;i++) for(int j=0;j<a.length;j++) a[j][i] = nextInt();}
	public int[][] nextIntMatrix(int n,int m) { int[][] a = new int[n][]; for(int i=0;i<n;i++) a[i] = nextIntArray(m); return a;}
	public char[][] nextCharMap(int n,int m) { char[][] a = new char[n][]; for(int i=0;i<n;i++) a[i] = nextCharArray(m); return a;}
	public void close() { super.close(); try {in.close();} catch (IOException e) {}}
}