4.3
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4.4 You can not end a element with before another element.
4.5 The contents of an element must be placed between the start tag and end tag. It is a misnested tag.
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4.6 a
4.6 b
4.6 c
4.7 a
4.7 b
4.7 c
4.7 d
4.7 e
4.8
4.9
