dMHP
d for down
and then MHP is an abbreviation for MP+HP.
From there you should be able to figure the rest of it out.
This way you don't have to write songs like 2LK+MK+HK, 8MP+HP, 5MK, 5LK+HK, or even :D::LK:+:MK:+:HK:, :U::MP:+:HP:, :MK:, :LK:+:HK:, you can just write dLMHK uMHP MK LHK...