Linear OA(7⁷³, 3377, F₇, 19) (dual of [3377, 3304, 20]-code), using 3303 step VarÅ¡amov–Edel lengthening with (r_i) = (4, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 4 times 0, 1, 4 times 0, 1, 5 times 0, 1, 6 times 0, 1, 6 times 0, 1, 8 times 0, 1, 9 times 0, 1, 10 times 0, 1, 11 times 0, 1, 13 times 0, 1, 15 times 0, 1, 17 times 0, 1, 19 times 0, 1, 21 times 0, 1, 24 times 0, 1, 26 times 0, 1, 30 times 0, 1, 34 times 0, 1, 38 times 0, 1, 42 times 0, 1, 47 times 0, 1, 53 times 0, 1, 59 times 0, 1, 66 times 0, 1, 74 times 0, 1, 83 times 0, 1, 92 times 0, 1, 103 times 0, 1, 115 times 0, 1, 129 times 0, 1, 143 times 0, 1, 160 times 0, 1, 178 times 0, 1, 199 times 0, 1, 222 times 0, 1, 248 times 0, 1, 276 times 0, 1, 308 times 0, 1, 343 times 0) based on linear OA(7¹⁹, 20, F₇, 19) (dual of [20, 1, 20]-code or 20-arc in PG(18,7)), using

• dual of repetition code with length 20 [i]