Nothing! Rich (the main administrator of this forum) thinks it's cool to have programs in as least lines as possible. Everyone else thinks it is stupid! Originally, the limit was 20 lines, 5 commands a line, and was a better but everyone just made complicated formulas that were hundreds of characters long.
It has been said somewhere that it is easier to develop your program as one command per line (easier to debug, easier to insert commands, e.t.c.), and then post this version as well as a compacted multicommand per line program.
I like to split up the posted programs back to one command per line to learn how they work but it is very time consuming.
The programmer formerly known as sonic