why these test maps exist in hl2 Mirrored mod?

Channel:
United States 不明2
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Published on ● Video Link: https://www.youtube.com/watch?v=BH-1WqkV2Yo


Half-Life 2
Game:
Half-Life 2 (2004)
Duration: 3:54
31 views
2

along with 3 unused folders:unused_cfg,unused_resource and unused_scripts
https://www.moddb.com/mods/half-life-2-mirrored



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