MSDN
https://social.msdn.microsoft.com/Forums/en-US/f04c8479-cd1a-435d-a79c-22b7d40ef4dd
nsdn, ksdn, jsdn, madn, mzdn, mxdn, mddn, medn, mwdn, mssn, msxn, mscn, msfn, msrn, msen, msdb, msdm, msdj, msdh, sdn, mdn, msn, msd, smdn, mdsn, msnd, mmsdn, mssdn, msddn, msdnn