False positive: "A" flagged as wrong article when it's not used as an article

**What got flagged?**

> For example, A and AAAA records can disclose IP addresses associated with a domain,

**Why is this incorrect?**

"A" seems to be some kind of record type. We can tell it's not an article because it comes before "and" rather an the rest of a noun phrase, such as a noun or an adjective.

Reproduce the reported sentence in Harper and inspect how the grammar checker identifies the standalone "A" as an article. Determine how record types such as "A" and "AAAA" should be distinguished from actual articles, then verify that the example is no longer flagged without regressing genuine article checks.

Written by the indexing model from the issue text.