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This is the calendar the Roman Senate ended up with:

Januarius 29
Februarius 23
Mercedonius 23
THE REST OF FEBRUARIUS NO I AM NOT KIDDING 5
Martius 31
Aprilis 29
Maius 31
Junius 29
Quintilis 31
Sextilis 29
September 29
October 31
November 29
December 29

See what I meant about Mercedonius being an intercalary month? It's literally in the middle of February. Like, they got 3/4 of the way through February, got bored, and decided to do something else for a month and come back later.