Linear OA(7⁵², 469, F₇, 18) (dual of [469, 417, 19]-code), using 416 step VarÅ¡amov–Edel lengthening with (r_i) = (3, 2, 1, 1, 1, 1, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 4 times 0, 1, 4 times 0, 1, 5 times 0, 1, 6 times 0, 1, 7 times 0, 1, 8 times 0, 1, 9 times 0, 1, 11 times 0, 1, 12 times 0, 1, 14 times 0, 1, 16 times 0, 1, 18 times 0, 1, 20 times 0, 1, 23 times 0, 1, 26 times 0, 1, 30 times 0, 1, 33 times 0, 1, 37 times 0, 1, 43 times 0, 1, 48 times 0) based on linear OA(7¹⁸, 19, F₇, 18) (dual of [19, 1, 19]-code or 19-arc in PG(17,7)), using

• dual of repetition code with length 19 [i]