Qqwweerrttyyuuiioopp Aassddffgghhjjkkll

top_row = "qwertyuiop" home_row = "asdfghjkl"

To understand this keyword, one must look at the physical layout of the QWERTY keyboard. The sequence is constructed by doubling every character in the top and home rows: qqwweerrttyyuuiioopp aassddffgghhjjkkll