On the diagram below, identify the covalent bonds that break when hydrolytic attack results in depurination. 
Definitions:
NPV
The calculation used to find the current value of future cash flows minus initial investments, which helps in evaluating the feasibility of investments or projects.
Credit Policy
The guidelines a company follows to determine creditworthiness, terms of credit, and how to collect owed money, affecting its trade credit and financing approaches.
Accounts Receivable Approach
A method used to estimate the value of a firm's accounts receivable and gauge the potential for uncollectible invoices.
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