Linear OA(2²⁵², 585, F₂, 54) (dual of [585, 333, 55]-code), using 47 step VarÅ¡amov–Edel lengthening with (r_i) = (6, 3, 2, 1, 1, 1, 1, 1, 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, 1, 4 times 0) based on linear OA(2²²⁵, 511, F₂, 54) (dual of [511, 286, 55]-code), using

• the primitive narrow-sense BCH-code C(I) with length 511 = 2⁹−1, defining interval I = [1,54], and designed minimum distance d ≥ |I|+1 = 55 [i]