It may be a typo, an internal code, a misspelling of a name (e.g., “Don 2022” + “MMSUB” as an acronym), or a reference to something highly niche or non-public.
Don 2022 Mmsub Guide
It may be a typo, an internal code, a misspelling of a name (e.g., “Don 2022” + “MMSUB” as an acronym), or a reference to something highly niche or non-public.
