crispr-Dr Eric olsan

Hi

Yesterday I Watched a video.Dr olson told crispr.

summary

deletıon of exon: use to crispr and dmd convert to  becker( ıts look like exon skipping)

nonse mutation:same dmd convert to becker

duplication:full cure

but ı am not sure how do full cure or how do dmd to be becker level?