This might help: How can I visualize my complex data structure? (short answer: Data::Dumper).

If you want to know how many hashes with the start/end keys you have, this should do it.

my $count = map { @{ $_ } } values %somehash;

# longer way
use List::Util 'sum';

my $count = sum map { scalar @{ $_ } } values %somehash;
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If that's not the number you're looking for, then I'm not sure what is. Can you explain further?