A proprietary concern issued four security cheques from two accounts. Two bounced for insufficient funds, and two were returned due to a blocked account. The complainant filed a single complaint for all four cheques under Section 138 of the Negotiable Instruments Act. The key question is whether this single complaint is maintainable. Generally, multiple cheques can be included in one complaint if they relate to the same transaction and are issued by the same person, but the exact number that can be clubbed may depend on whether the transactions are distinct or part of a single series.