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  1. or download this
    #!/usr/bin/perl

...
print scalar human([' - ', undef, ' and '], 'aa' .. 'ba', '-100' .. 4)
+, "\n\n";

__END__
  2. or download this
    Read chapters: 1-3, 5, 7-9, 11, 14 before friday.
Read these chapters by friday:
1 through 3
...

aa-ba, -100-4
aa - ba and -100 - 4