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Write a formal letter to the Chairman of the Department of Computer Science and Engineering at Bangladesh University of Business and Technology requesting a section change and course registration adjustment. The student’s name is Mehrab Hossain (ID: 22231203043) from Intake 43, Section 1. Due to financial constraints, the student had to drop the previous semester and is now seeking assistance with adjusting their course registration for the current semester. The letter should mention the transition from the tri-semester system to the bi-semester system, resulting in the student being registered for courses across different intakes. Include the details of the current and requested course registrations, such as:

CSE 319 - Computer Networks (change section from Section 1 to Section 2)
CSE 320 - Computer Networks Lab (change section from Section 1 to Section 2)
Request to change these courses to:
CSE 321 - Artificial Intelligence & Expert Systems
CSE 322 - AI & Expert Systems Lab
The tone should be polite, respectful, and professional. Close with a thank you for their understanding and assistance."