File list (Check if you may need any files):
OffsetDemo6_1
.............\cross.txt
.............\crossInSquare.txt
.............\example1.txt
.............\example2.txt
.............\example3.txt
.............\example4.txt
.............\OffsetDemo6_1.exe
.............\symmetry1.txt
.............\symmetry2.txt
.............\symmetry3.txt
.............\symmetry4.txt
.............\symmetry5.txt
.............\x-12lineSquare(LineOverlapped).txt
.............\x-40lineSquare.txt
.............\x-8lineSquare.txt
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