On December 15, 2024, various companies engaged in the following transactions:

1. Alpha Corporation sold $20,000 worth of merchandise on credit to Beta Enterprises.
2. Beta Enterprises returned $4,000 worth of defective merchandise to Alpha Corporation.
3. Gamma Inc. purchased $30,000 of office equipment on credit from Delta Suppliers.
4. Delta Suppliers provided $5,000 worth of office cleaning services to Epsilon Services on credit.
5. Epsilon Services paid $2,500 for maintenance and repair services provided by Zeta Maintenance.
6. Zeta Maintenance received $10,000 cash for services rendered to Theta Technologies.
7. Theta Technologies purchased $15,000 of software licenses from Iota Software on credit.
8. Iota Software granted a $1,500 discount to Theta Technologies for bulk purchase of software licenses.
9. Kappa Corporation paid $7,000 for legal services provided by Lambda Law Firm.
10. Lambda Law Firm received $4,500 in cash as a retainer fee for future legal services.

Please journalize these transactions for the respective companies involved.