*Main> doLZW ['\0'..'\255'] "TOBEORNOTTOBEORTOBEORNOT"
[84,79,66,69,79,82,78,79,84,256,258,260,265,259,261,263]

*Main> undoLZW ['\0'..'\255'] [84,79,66,69,79,82,78,79,84,256,258,260,265,259,261,263]
"TOBEORNOTTOBEORTOBEORNOT"