You must be an expert!
This video is a documentary on my entire career as anapplications engineerexpert. I swear I've been the blue shirt guy in that exact meeting.
My solution: all red, no ink (unless of course you print it), max perpendicularity of 7 lines, with a balloon kitten
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We wanted transparent red lines....you do know what transparent means don't you?
I used invisible red ink, see below.