Linear OA(2²³⁸, 587, F₂, 50) (dual of [587, 349, 51]-code), using 45 step VarÅ¡amov–Edel lengthening with (r_i) = (7, 3, 3, 2, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 4 times 0, 1, 4 times 0) based on linear OA(2²⁰⁷, 511, F₂, 50) (dual of [511, 304, 51]-code), using

• the primitive narrow-sense BCH-code C(I) with length 511 = 2⁹−1, defining interval I = [1,50], and designed minimum distance d ≥ |I|+1 = 51 [i]