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ลำดับที่	LC	คำอธิบาย
21		Warehouses. Storage
22		Office equipment and supplies
23		Office management
24		Industrial psychology
25		Personnel management. Employment management
26		Accounting. Bookkeeping
27		Business mathematics. Commercial arithmetic Including tables, etc.
28		Business communication Including business report writing, business correspondence
29		Business records management
30		Shipment of goods. Delivery of goods
31		Advertising
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