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Fetch [SOCKS5 proxies](https://mullvad.net/en/help/socks5-proxy/) from [Mullvad's API](https://api-relays.mullvad.net/network/v1-beta1/socks-proxies) and optionally filter by `country`, `city`, `datacenter`, `weight` and `online` status. Print as IPv4/IPv6 or hostname, optionally add scheme and port.