Day 4-arms(superset tris and bis)

Straight barbell curl-4 sets, 4-6-8-10 reps
Skull crushers-4 sets, 4-6-8-10 reps
Dumbellcurls-3 sets, 8-10-10-12 reps
Cable pressdowns-3 sets, 8-10-10-12 reps

I notice that on arm day (as shown above) it says to super set these exercises...

so does that mean I go from Straight Barbel curls to (without rest... hence making it a superset) Skull crusher then rest... and thats one set... and do that again 3 more times to complete the 4 sets...

and then do the same for the last two exercises?

or is there a dfferent way?

thanks