Yeah, I thought about including this one, but I agree it's fairly subtle. You're also correct that this usage rule is falling by the wayside.According to Webster's, alright is "unacceptable" as a substitute for all right. This usage rule is probably biting the dust, which is too bad. The correct form even looks better.
Similarly, split infinitives and pluralized hyphenated words like 'mother-in-laws' are now generally deemed acceptable in non-formal writing.
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