import java.io.IOException; import java.io.InputStream; import java.io.PrintWriter; import java.math.BigInteger; import java.util.Arrays; import java.util.NoSuchElementException; public class Main { public static void main(String[] args) { new Main().run(); } long inv(long a) { return pow(a,MOD-2); } long pow(long a,long n) { return n!=0?pow(a*a%MOD,n/2)*(n%2==1?a:1)%MOD:1; } final long MOD=(long)1e9+7; void run() { FastScanner sc=new FastScanner(); int H=sc.nextInt(); int W=sc.nextInt(); long[][] A=new long[H][W]; long[] AH=new long[H]; long[] AW=new long[W]; long[] zH=new long[H]; long[] zW=new long[W]; int zeros=0; long tot=1; Arrays.fill(AH, 1); Arrays.fill(AW, 1); for (int i=0;i0) { int r=sc.nextInt()-1; int c=sc.nextInt()-1; if (zH[r]+zW[c]-(A[r][c]==0?1:0)!=zeros) { System.out.println(-1); } else { long ans=tot*inv(AH[r])%MOD*inv(AW[c])%MOD; if (A[r][c]!=0) { ans=ans*A[r][c]%MOD; } pw.println(ans); } } pw.close(); } void tr(Object...objects) {System.out.println(Arrays.deepToString(objects));} class FastScanner { private final InputStream in = System.in; private final byte[] buffer = new byte[1024]; private int ptr = 0; private int buflen = 0; 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 boolean isPrintableChar(int c) { return 33 <= c && c <= 126;} private void skipUnprintable() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;} public boolean hasNext() { skipUnprintable(); 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 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() { return (int)nextLong(); } } }