Executable commends

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make -> compile full pdf

make clean -> clean all generated files (keep .tex & .bib)

make split -> split main.pdf, keep first 5 pages for main text submission -> 写完11000字符（大概4页半）再用！

make bib -> generate sorted bib, to input doi on submission site -> 写完11000字符（大概4页半）再用！

Requirements:

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1. install local Xelatex to compile
2. python with PyPDF2 package