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README.md

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+## SNU eTL batch downloader
+
+Download all files from lectures of SNU eTL.
+
+Skips already downloaded files
+
++) 2FA verification code (mail) required.
+
+### Usage
+
+From `etl.py`
+
+```
+sync_etl(209133, "Computer_Networking")
+sync_etl(219314, "System_Programming)
+```