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"As you read a Delta Booking Class Codes textbook or study your class notes, stop and close the book from time to time and ask yourself questions like: What are the core concepts? What terms or concepts are I new to? How would I define them? How do these concepts relate to what I already know? Or we can complete the questions at the end of each chapter, they are good self-assessment material, through self-assessment to understand what you know and what you don't know."
<https://www.youronlinecourses.org/delta-booking-class-codes>