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In the test "For example, replace < with <. (See also section 7.3 Writing Character Data)" should the parethesized text not appear before the full stop? i.e. "For example, replace < with < (see also section 7.3 Writing Character Data)." or alternatively "For example, replace < with <. (See also section 7.3 Writing Character Data.)"
Checking the text further, usually the text contains ). and only occasiionaly contains .) The latter probably needs to be expunged.
Fixed all occurrences if this.