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  1. or download this
    perl -e 'my @a="aa".."zz"; print "Length=".@a;'
    
  2. or download this
    perl -e 'my @a="aa".."zz"; print scalar(@a);'
    
  3. or download this
    perl -e 'my @a="aa".."zz"; print @#a;'
    
  4. or download this
    perl -e 'print length($("aa".."zz"));'
    
  5. or download this
    perl -e 'print length(@("aa".."zz"));'
    
  6. or download this
    perl -e 'my $len=@("aa".."zz");print $len;'