Japanese movelist notation?

I was wondering with the numerical system they use for movelists ie f,f+k being 6,6+k. How do you imply the difference between taps and hold as there are no lower case numbers? Any help you guys could lend would be much appreiciated.

Under the surface of the most jaded cynic lies a dissappointed idealist- George Carlin

 

df,DF would be something like this: 3,3_. _ notes hold.

 

Okay so the _ after the number implies hold. Thank you very much.

Under the surface of the most jaded cynic lies a dissappointed idealist- George Carlin