Hi. I would like some help to group similar phrases and substitutes them for a few words.
For example:
aortic valve replacement
aortic valve replacement, mitral valve repair
coronary artery bypass, aortic valve replacement
group the 3 and name it as aortic valve replacement
I have tryed to use Recode but the buttom Recode do not appear to be. is this because the file has so many sentences?