- Letter:
AllA(6)B(5)C(7)D(26)E(3)F(12)G(5)H(6)K(13)L(4)M(7)N(22)R(3)S(12)T(5)U(2)X(4)Symbol(5)Digital(3)More
- Operating System:
AllWindows 95(5)Windows 98(5)Windows Me(5)Windows XP(5)Windows Vista(5)Windows 7(5)Windows 8(5)Windows 10(5)Windows 2000(5)Windows Server 2003(5)Windows Server 2008(5)Windows Server 2012(5)Windows Server 2016(5)Mac OS Classic(5)macOS(5)Linux(5)Android(5)iOS(5)