In addition to all the other fine advice given in this thread...

#two arrays of arrays to populate

@aoa=qw/header font content/ ;
@aoac=qw/headerc fontc contentc/;
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Those are not arrays of arrays. They're simply arrays (that is, arrays of scalars).

If you haven't done so lately, I highly recommend you read perlreftut, perllol, perldsc, and perlref (in that order).