Get number total User counts for each DB within SQL Server instance ?

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Hello, can someone provide me a query to list all User DBs (not including master, model, msdb, tempd) within a SQL Server instance and their number of Total Users counts (not including system dbo, guest, INFORMATION SCHEMA, sys) that has access to each DB?
Output would be something like this:
[Database Name] [Total Users]
Products = 3
Sales = 7
Invoices = 11
etc...
Am thinking GROUP BY would be used along those lines.
Thanks in advance.