program Project2;

{$APPTYPE CONSOLE}

uses
  SysUtils;

var
  a: array [1..100000] of integer;
  i, j, n, m, f, max: integer;

function mx(a, b: integer): integer;
begin
  if(a > b)then mx := a
  else mx := b;
end;

begin
  readln(n);
  for i := 1 to n do
  begin
    for j := 1 to 10000 do a[j] := 0;
    max := 0;
    readln(m);
    for j := 1 to m do
    begin
      read(f);
      inc(a[j]);
      inc(a[f]);
      max := mx(max, a[j]);
      max := mx(max, a[f]);
    end;
    writeln(max);
  end;
end.