Long description

The figure illustrates a rectangle containing nine columns and eight rows. The column is numbered from 0 to 8 and rows are numbered from 0 to 7. Columns 2 to 7 in the second row and fourth row are shaded in dark. Row 2, 3 of column 2, and column 6 are also shaded in dark. Columns 3, 4, and 5 of the second and third row are shaded in a light color.