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: Distinguish between Mountain Folds (folded away from you, looks like a peak) and Valley Folds (folded toward you, looks like a trough).

The code doesn't match a widely known academic paper or standard document. It is often a internal code used by creators on platforms like: Papermodels.com or Zealot.com (for vehicles/ships). Etsy or Gumroad (for wearable armor/props).

: Lightly run a dried-out pen or the back of your blade along the fold lines to ensure crisp, clean bends.