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numbering - How to number and cross-reference \subsubsection-level headers - TeX - LaTeX Stack Exchange
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sectioning - Make section, subsection and subsubsection begin on the left of page and on the same level - TeX - LaTeX Stack Exchange
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sectioning - How to add an extra level of sections with headings below \subsubsection - TeX - LaTeX Stack Exchange
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cross referencing - (sub)section with number, subsubsection with letter - \ref shows only the letter - TeX - LaTeX Stack Exchange
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