I have a hard time telling the difference, too, but to me, S curves are waves (2), and spirals are curls (3). But the longer you're on CG or modified CG, the more you may see your pattern changing.
3a/b, F, normal porosity

Wash with either Suave Tropical Coconut, As I Am, or CJ Daily Fix
Condition with STC or Yes to Blueberries and detangle with Denman, rinse very lightly (baptismal rinse)
Add LAL gel, either Sport or Wet Look, scrunch with flour sack towel, and plop
Diffuse 5 minutes, then air dry