-=head1 ATTRIBUTES
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-=head2 accounts
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-Get an arrayref of accounts.
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-=head2 commodities
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-Get an arrayref of commodities.
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-=head2 payees
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-Get an arrayref of payees.
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-=head2 tags
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-Get an arrayref of tags.
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-=head2 transactions
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-Get an arrayref of transactions.
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-=head1 METHODS
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-=head2 new
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- $ledger = App::HomeBank2Ledger::Ledger->new(%ledger_data);
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-Construct a new ledger instance.
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-=head2 add_accounts
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-Add accounts.
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-=head2 add_commodities
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-Add commodities.
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-=head2 add_payees