I am stuck with the "S"-Bug in the LeChuck Text.
Obviously I should delete the whole text above the capital letter "T" for example by pressing "dgg", leaving just:
Then things really got ugly.
But the stupid bug is in the way and since you can not edit that text, killing it with a simple "5s" combo won't work...
You reach this text block nearing the end of the level after opening the left of the two red doors. I already cleared the right side and unlocked the "."-Command.