""it involves a certain knowledge of how to represent colours as letters on a computer""

Does anyone have any idea how to do this?

EDIT

I used an image editor to get these following names

ff00ff
eee001
00aa01
rrrrrr
0ee0ed
f0f0f0
0fff00
100eee
c0cc0a
tttttt

The rrrr and tttt lines are letters given to me.

Hrrrrrmmm

-'rilla