wouldn't always say so. After half a year I was usually baking a solution and then compressing it, but aorn, I do solutions for 8-5kyu directly crushed, since you get a feeling for how it may be in a compressed version. 4kyu and below are too hard for straight up coming up with onerliners though.

Actually one-liners start with several lines. And then they try to combine it into one line. I know this because I did it that way.

can't agree more

there are always some smart guys can complete in one line