Just checked, sed isn't on that list. And lisp sounds a bit simpler than sedtris - tetris in sed (https://news.ycombinator.com/item?id=2430171 https://news.yco

Just checked, sed isn't on that list. And lisp sounds a bit simpler than sedtris - tetris in sed (https://news.ycombinator.com/item?id=2430171 https://news.ycombinator.com/item?id=2430171, https://news.ycombinator.com/item?id=2430171 https://news.ycombinator.com/item?id=2430171) - so that could be an interesting challenge.... hmm...