new_contents: #!/bin/python3
  
  import math
  import os
  import random
  import re
  import sys
  
  # Complete the whatFlavors function below.
  def getCostTable(arr):
      costable = {}
      for idx, val in enumerate(arr):
          costable[val] = idx
      return costable 
  
  def whatFlavors(cost, money):
      costable = getCostTable(cost)
  
      for idx, val in enumerate(cost):
          key = (money - val)
          idx2 = costable.get(key)
          if idx2!= None and idx != idx2:
              print(idx+1, idx2+1)
              break
  
  if __name__ == '__main__':
      t = int(input())
  
      for t_itr in range(t):
          money = int(input())
  
          n = int(input())
  
          cost = list(map(int, input().rstrip().split()))
  
          whatFlavors(cost, money)
  
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