A keyboard is configured for inputting letters of an alphabet into a computing device. The keyboard has a left-side keyboard section and a right-side keyboard section. The left-side keyboard section comprises a left-side cluster of letter keys formed from letter keys in multiple different left-side rows, including a left-side top row and a left-side bottom row that each has only a single letter key. Letter keys forming a perimeter of the left-side cluster are arranged around the perimeter in alphabetical order according to said alphabet. Similarly, the right-side keyboard section comprises a right-side cluster of letter keys formed from letter keys in multiple different right-side rows, including a right-side top row and a right-side bottom row that each has only a single letter key. Letter keys forming a perimeter of the right-side cluster are arranged around the perimeter in alphabetical order according to said alphabet.