code:
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| <letter> ::= [a-zA-Z] <digit> ::= [0-9] <letter-digit> ::= <letter> | <digit> <letter-digit-hyphen> ::= <letter-digit> | "-" <letter-digit-hyphen-string> ::= <letter-digit-hyphen> | <letter-digit-hyphen-string> <letter-digit-hyphen> <label> ::= <letter-digit> [ [ <letter-digit-hyphen-string> ] <letter-digit> ] <subdomain> ::= <label> "." | <subdomain> <label> "." <top-level-domain> ::= <letter> <letter> [ <letter> [ <letter> ] ] <second-level-domain> ::= <letter> <letter> [ <letter> ] "." <domain> ::= [ <subdomain> ] [ <second-level-domain> "." ] <top-level-domain> |
snie de bedoeling he ?