For the study, it might be best to keep them in order of the 500 different openings: Volume A (Flanks), B (Semi 1.e4 ), C (Open 1. e4), D (Closed 1.d4) & E (ID 1.d4).
Puzzle¦Move¦ Opening Code
61652 ¦ 14 ¦ B50
71061 ¦ 05 ¦ C41
71123 ¦ 13 ¦ A52
71243 ¦ 09 ¦ D00
71244 ¦ 07 ¦ B10
71328 ¦ 09 ¦ C25
71335 ¦ 08 ¦ C28
71345 ¦ 13 ¦ A80
71459 ¦ 12 ¦ C03
lichess.org/training/71459
Puzzle¦Move¦ Opening Code
61652 ¦ 14 ¦ B50
71061 ¦ 05 ¦ C41
71123 ¦ 13 ¦ A52
71243 ¦ 09 ¦ D00
71244 ¦ 07 ¦ B10
71328 ¦ 09 ¦ C25
71335 ¦ 08 ¦ C28
71345 ¦ 13 ¦ A80
71459 ¦ 12 ¦ C03
lichess.org/training/71459