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my @institutions = qw|hospital1 hospital2|; my %seen; ... } else { $institution_table{"other"} ++; }
my $cat_age = int ($age/5) - 9; my @age_cats = qw|fortyfive_fifty fifty_fiftyfive fiftyfive_sixty|; ... foreach (keys %institution_table) { $institution_table{ $_ }{ $age_cats[$cat_age] }++; }