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<program> ---> <command or definition>*
<command or definition> ---> <command> | <definition>
| <syntax definition>
| (begin <command or definition>+)
<definition> ---> (define <variable> <expression>)
| (define (<variable> <def formals>) <body>)
| (begin <definition>*)
<def formals> ---> <variable>* | <variable>* . <variable>
<syntax definition> ---> (define-syntax <keyword> <transformer spec>)
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