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2-packets
2-packets is an lower-level esoteric programming language which relies on the presence of advanced persistent threats in order to do computations on the other side of a firewall!
Generally the motivation behind using 2-packets is the theory that there is no firewall which exists that can prevent the penetration of at-most 2 packets. Due to this, there is a programming language which relies on low-level computation to feed input into the network and perform the given process.
Class
It is a Turing-tarpit without no specific constraints beyond being low-level and functions over 2 packets.