how to edit animated gifs on ubuntu with gifsicle to reduce size

mkdir 66213
cd 66213
gifsicle --explode ../66213.gif 
# delete the frames that that dont hurt the animation
gifsicle -O2 --colors 64 --dither --delay=100 --loop *.gif* > ../66213-o.gif
# or
gifsicle --optimize --colors 170 --delay=100 --loop *.gif* > ../66213-o.gif