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~<Esperanto> $C = [pbtdkgmnfvszŝĵcĉĝĥhwjlr] $V = [iueoa] $_ = [⟨C⟩⟨V⟩] * Invalid letters + ^ ⟨_⟩+ $ ?+ scii ?! axa * More than 5 consonants sequentially ! ⟨C⟩{6} ?+ ekssklavo ?! eksskrla