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http://www.geo-clil.ugent.be/wp-content/uploads/2016/01/expressions.pdf
https://ocw.mit.edu/courses/mathematics/18-06-linear-algebra-spring-2010 /video-lectures/lecture-1-the-geometry-of-linear-equations/
https://www.englishclub.com/speaking/greetings-classroom.htm
https://dictionaryblog.cambridge.org/2015/09/30/ lectures-lessons-and-seminars-words-and-phrases-for-talking-about-studying-2/
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