deletions | additions       diff --git a/Lecture_1_4_Disciplines_What__.md b/Lecture_1_4_Disciplines_What__.md  index 920bb22..f1e5980 100644  --- a/Lecture_1_4_Disciplines_What__.md  +++ b/Lecture_1_4_Disciplines_What__.md 
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# Lecture 1 **Lecture 1**  # 4 Disciplines:  What are the 4 disciplines this course brings together? What links them together? 
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