เพิ่มเมื่อ: 2018-02-06 23:43:31.0
 แก้ไขล่าสุด: 2018-09-12 11:10:44.0
		                        	The Theory Books are coordinated page-by-page with the Lesson Books, and reinforce the concepts through theory games and drills that are fun to complete.
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