This is intro text; it should remain at page top.
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This is an unorthodox h1 headed section. Normally we start headings with h2 instead because h1 is used for a page's name in MediaWiki and it is therefore illogical to use if for page section headings.
Second paragraph of section 0
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Text of section 1
1.1Edit
Text of section 1.1
1.2Edit
Text of section 1.2
Second paragraph of section 1.2
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Text of section 2
2.1Edit
Text of section 2.1
2.2Edit
Text of section 2.2
2.2.1.1Edit
Text of too-low-level section 2.2.1.1
2.3Edit
Text of section 2.3
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Text of section 3
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Text of section 4
Second paragraph of section 4