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

Input parameters:

1. Bs → Rectangular base cell.
2. X- → Number of repeats in the negative X direction.
3. X+ → Number of repeats in the positive X direction.
4. Y- → Number of repeats in the negative Y direction.
5. Y+ → Number of repeats in the positive Y direction.

Output parameters:

1. Pt → Points on the grid.
2. Cl → Repeating grid cells.