Generate a two-dimensional grid by repeating a triangular cell.

Input parameters:

1. Bs → Triangular base cell.
2. AB → Number of repeats departing from the AB edge.
3. BC → Number of repeats departing from the BC edge.
4. CA → Number of repeats departing from the CA edge.

Output parameters:

1. Pt → Points on the grid.
2. Ca → Repeating grid cells.
3. Cb → Inverted triangle cells.