[racket] please i need your help using Scheme

Dear all

I am a student at AL-QUDS University in Palestine, I need your help 
as possible .

Please help me by showing me how can I use Scheme or by DrRacket software to 
build the parser for this Grammar:


 expression -> number expression_tail
 expression_tail -> + expression expression_tail  

 expression_tail -> Ø 

 Example on valid expression: "5 + 4 + 3 + 6 +7”


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Firas .M. Abu Hassan
Web Developer
SKITCE
Alquds University


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