var
  x,y,time,i,j,t,n:longint;
  w,gx,gy:array[0..100000]of longint;
  g:array[-1001..1001,-1001..1001]of longint;

begin
  assign(input,'coconuts.in'); reset(input);
  assign(output,'coconuts.out'); rewrite(output);
  readln(t);
  for time:=1 to t do
  begin
    readln(n);
    for i:=1 to n do
     for j:=1 to n do
     g[i,j]:=0;

    for j:=0 to n+1 do g[0,j]:=maxlongint;
    for i:=1 to n do
    begin
      readln(y,w[i]);
      for x:=n downto 0 do
      if g[x,y]>0 then
      begin
        if (g[x,y-1]>0)and(g[x,y+1]>0) then
        begin
          g[x+1,y]:=i;
          gx[i]:=x+1;
          gy[i]:=y;
          break;
        end;

        if (g[x,y-1]=0)and(g[x,y+1]=0) then
        begin
          if w[i]>w[g[x,y]] then
          begin
            g[x,y+1]:=g[x,y];
            gx[g[x,y+1]]:=x;
            gy[g[x,y+1]]:=y+1;

            g[x,y]:=i;
            gx[g[x,y]]:=x;
            gy[g[x,y]]:=y;
            break;
          end
          else begin
            g[x,y-1]:=i;
            gx[i]:=x;
            gy[i]:=y-1;
            break;
          end;
        end;

        if (g[x,y-1]>0)and(g[x,y+1]=0) then
        begin
          if w[i]>w[g[x,y]] then
          begin
            g[x,y+1]:=g[x,y];
            gx[g[x,y+1]]:=x;
            gy[g[x,y+1]]:=y+1;

            g[x,y]:=i;
            gx[g[x,y]]:=x;
            gy[g[x,y]]:=y;
            break;
          end
          else begin
            g[x,y+1]:=i;
            gx[i]:=x;
            gy[i]:=y+1;
            break;
          end;
        end;

        if (g[x,y-1]=0)and(g[x,y+1]>0) then
        begin
          if w[i]<w[g[x,y]] then
          begin
            g[x,y-1]:=i;
            gx[i]:=x;
            gy[i]:=y-1;
            break;
          end
          else begin
            g[x,y-1]:=g[x,y];
            gx[g[x,y-1]]:=x;
            gy[g[x,y-1]]:=y-1;

            g[x,y]:=i;
            gx[g[x,y]]:=x;
            gy[g[x,y]]:=y;
            break;
          end;
        end;
      end;
    end;
    for i:=1 to n do writeln(gx[i],' ',gy[i]);
    if time<t then writeln;
  end;
  close(input);
  close(output);
end.