This paragraph demonstrates all possible tag combinations. Important emphasized text shows the most common pattern. Important underlined text highlights key steps. Important highlighted text marks critical information. Emphasized underlined text draws attention to notes. Emphasized highlighted text emphasizes key points. Underlined highlighted text creates special markers. ~~Important deleted text~~ shows deprecated features. ~~Emphasized deleted text~~ indicates obsolete content. Chemical formulas like H₂O use subscript. Mathematical expressions like X² use superscript. _{Emphasized subscript} for variables. ^{Emphasized superscript} for annotations. Three-tag combinations: Important emphasized underlined for critical concepts. Important emphasized highlighted for core content. Important underlined highlighted for key identifiers. Emphasized underlined highlighted for special emphasis. Scientific notation: H₂O and X². Version identifiers: v^2.0 and v₀. This comprehensive test covers all supported tag combinations.

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