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=={{header|Racket}}==
Racket can be configured to run a REPL, run a main function, or just run top-level expressions. A <tt>main</tt> function can be run by executing <tt>racket -tm program.rkt</tt>.
<lang lisp>
#/usr/bin/env racket -tm
#lang racket
(provide main)
(define (main . args) (displayln "Hello World!"))
</lang>
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