Guess the Idol(s) by Their Debut Song

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Across
  1. 2. LaChaTa
  2. 3. Noona Neomu Yeppeo (Replay)
  3. 6. Bad Girl Good Girl
  4. 8. Break It
  5. 9. Warrior
  6. 10. Hug
  7. 11. Face
  8. 14. Bad Girl
  9. 15. I Want You Back
  10. 16. Twins (Knock-Out)
  11. 19. Oh Yeah
Down
  1. 1. Ah
  2. 3. Push Push
  3. 4. Into the New World
  4. 5. ID Peace B
  5. 7. Lies
  6. 9. LaLaLa
  7. 12. Clap
  8. 13. Tilt My Head
  9. 17. Mama
  10. 18. Not Young