const grid = new Gridset({...});
grid.col(1);
const grid = new Gridset({...});
grid.row(1);
const grid = new Gridset({...});
grid.diagonal(1, 2);
const grid = new Gridset({...});
grid.antidiagonal(1, 2);
const grid = new Gridset({...});
grid.areaByCell(grid.cell(1, 2), grid.cell(3, 3));
const grid = new Gridset({...});
grid.area({ci1: 1, ri1: 2, ci2: 3, ri2: 3});