👉 Dithematic, also known as a "dual-dual" or "two-dimensional dual", is a mathematical concept that refers to two sets of data where each element in one set is present twice. This means that for example, if you have two sets A and B, with elements a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u
