Below is my attempt at reformatting per all constraints—no leading title line after intro note omission requirement fully respected yet internal headings follow spec strictly using only

?Actually request said small subtitles use i.e.。H tag variants presumably meaning H,H,H…It probably means lower-case variants like 'H' letter case irrelevant so long as proper opening/closing syntax correct.) Let’s treat as valid any standard header tag numbers likely accepted such as 'H','HH','HHH'—but safest using numeric forms 'H'。'HH','HHH'. However typical markdown conversion expects lower-case tag names recognized by browsers if XHTML strict orwise case-insensitive generally fine eir way here assumed fine since original used lower-case '

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