The mod side does not define the "supported" side, but the "required" one. A mod with mod side "client" work only on the client, and can therefor be installed on a client even if the server does not have it. A mod with side "both" is required on both server AND client to work. Meanwhile, a mod with side "server" only needs to be installed on the server and can hence change the game even if players do not have any mods.
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