added Linear.Order #300
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added Linear.Order #300
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add theorems about linear order into line_trash
deleted theorems starting with MEOW
updated theorems on linear order and LiesInt/LiesOn ray
updated corollaries OVO and QWQ
added corollaries OVO_1 OVO_2 QWQ_1 QWQ_2
updated proofs of corollaries
renamed theorems with HAHAHA, HOHOHO, QAQ and QWQ
added several theorems to prove according to the plan
added theorems to prove according to plan
updated a part of the proof for lies_int_seg_nd_ext_iff_lies_int
proved theorem lies_int_seg_nd_ext_iff_lies_int and lies_on_seg_nd_ext_iff_lies_on
finished Order.lean
updated Angle_ex_trash and moved two theorems to IsocelesTriangle_trash moved lemmas about collinearity in Linear.Order to Linear.Line updated Index
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added Linear.Order
added proofs for Problem_5 Problem_6 Problem_7 and a part of Problem_11