Depending on your intent, here is how to handle these codes:

If you are looking for a guide to manage a file like 1300 users.txt containing codes for a platform like KuCoin or a similar service, 1. Data Cleaning & Preparation

Before using a list of 1,300 user codes, you must ensure the file is properly formatted.

Knowing the platform will help me provide the exact steps for using those codes. Bitcoin Trading | KuCoin

: Use a text editor or Python script to remove any duplicate codes.