In the example given below, the main diagonal (from top left to bottom right) is filled with sequence ordered as "α", "β", "γ", "δ", while the skew diagonal (from bottom left to top right) filled in the same order. The remaining cells are then filled column wise such that the complementary letters appears only once within a row, but twice within a column. In the first column, since "α" appears on the 1st and 4th row, the remaining cells are filled with its complementary term "δ". Similarly, the empty cells in the 2nd column are filled with "γ"; in 3rd column "β"; and 4th column "α". Each Greek letter appears only once along the rows, but twice along the columns. As such, the row sums are "α" + "β" + "γ" + "δ" while the column sums are either 2 ("α" + "δ") or 2 ("β" + "γ"). Likewise for the Latin square, which is obtained by flipping the Greek square along the main diagonal and interchanging the corresponding letters.