import strutils, sequtils

var
  n: int
  a: seq[int]
  dp: seq[seq[int]]
  t = stdin.readLine.parseInt

proc nya(i, j: int) : int =
  if dp[i][j] != -1: return dp[i][j]
  result = 2
  var x = a[j] - a[i]
  for k in j+1 .. <n:
    var y = a[k] - a[j]
    if (x > 0 and y > 0 and x < y) or
       (x < 0 and y < 0 and x < y) or
       (x > 0 and y < 0):
      result = max(result, nya(j, k)+1)
  dp[i][j] = result

for cases in 0 .. <t:
  n = stdin.readLine.parseInt
  a = stdin.readLine.split.map(parseInt)
  dp = newSeqWith(n, newSeqWith(n, -1))
  var res = 1
  for i in 0 .. <n:
    for j in i+1 .. <n:
      if a[i] == a[j]: continue
      res = max(res, nya(i, j))
  echo res