[ubuntu-x] Why is there no xserver-xorg-hwe-16.04-edge?

[N. W.]

Hi,

there is:

linux-generic-hwe-16.04
xserver-xorg-hwe-16.04

Then there also is:

linux-generic-hwe-16.04-edge 

So, why is there no:

xserver-xorg-hwe-16.04-edge

?

Regards