puzzle donkey 4

[nickycla]

Have discovered puzzledonkey.com

Am completely stumped on PD4 round 5 puzzle 15

Please, can anyone help?. Does anyone remember doing it?

It's a 6 x 4 grid. Each cell contains 1,2 or 3 letters. I know from hints I have found, I have to divide the letters into 2 groups, and then somehow into a third, and that will reveal the answer.

Any help appreciated.