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#!usr/bin/perl -w
use warnings;
my @list = ("a1", "b23", "c45", "d1");
print join (" ",@list),"\n"; 
#prints: a1 b23 c45 d1

include <stdio.h>
int main ()
...
   printf("\n"); 
}
// prints: a1 b23 c45 d1