Het is hun evenmin verboden overeenkomstig de aard van de te dekken risico's of de te verstrekken prestaties In onderscheiden stelsels van sociale zekerheid met bijzondere aansluitingsvoorwaarden te voorzien (zie 01). ###>Nor is there anything to prevent Member States from providing for different social security schemes involving special conditions for affiliation according to the nature of the risks to be covered or the benefits to be provided (see 01).