For example, the triangle strip (0, 1, 2, 3) will translate to two triangles (0, 1, 2) and (1, 2, 3).
Next, you reduce the number of indices by using triangle strips instead of triangles.
When I wrapped one triangle strip around the whole cube in Listing 1, I started with a triangle that is wound counter-clockwise (0, 1, 2).
Appearance of a triangle strip. Surface normals? Or windings?