just explain the Great Wave 4 dye sub keys.

Our tooling of dye sub key include Esc / horizon Enter / Space bar / vertical 1 x 2 Enter. 

Therefore we fit 3 keys on our V60THE2 and enclose vertical 1 x 2 Enter key as bonus inour color box.

 But you can also fit the vertical 1 x 2 Enter key on back space key to have a look even the row is not correct.