What is the Greek Blue Book and what can it do?

Greek blue paper is only for customers to enter Greece. You can't go to Schengen countries outside Greece with blue paper! Therefore, when you enter Greece with blue paper and choose flights, you can't choose flights connecting in other Schengen countries, because you have to leave the customs connecting in Schengen countries. Wrong case: flying to Greece with blue paper, the ticket was bought by Lufthansa, and the voyage: Beijing-Frankfurt-Greece, which is not acceptable! ! ! Because Germany is about to enter Schengen, and blue paper can only enter Greece, but other Schengen countries can't. Therefore, when entering Greece with blue paper, you should avoid Schengen transit when buying air tickets. /zd/ym