::= ( | | | ) | ( | | | ) | ( | | ) | ( | ) ::= "nick" ::= ( "ok" | "no" ( "taken" | "bad" ) ) ::= "rename" ::= "names" ::= | ,?*, ::= "quit" ::= "+" ::= "-" ::= "msg" ::= "msg" ::= "action" ::= "action" ::= "illegal command" ::=