[Encrypt-Keeper]

I've never seen a keyboard that does this. Just took a look around the office to confirm.

[lkbm]

Probably a typo—groups of 4 is (was?) standard. My Das Keyboard has this, as did all(?) the keyboards I used as a kid in the 80s and 90s.

[chii]

yes, i meant groups of 4, there's 3 groups in total!