import math;
size(7cm,0);

// picture grid(int Nx, int Ny, pen p=currentpen)
// Return an Nx by Ny unit square lattice with lower-left corner at (0,0).

add(grid(5,3,.5bp+blue));

add(shift(4,-3)*grid(2,4,1.2bp+red));

dot("$(0,0)$",(0,0),S,green);