Linear OA(2²³⁴, 604, F₂, 48) (dual of [604, 370, 49]-code), using 66 step VarÅ¡amov–Edel lengthening with (r_i) = (6, 3, 2, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 4 times 0, 1, 4 times 0, 1, 5 times 0, 1, 5 times 0, 1, 5 times 0, 1, 6 times 0) based on linear OA(2²⁰⁵, 509, F₂, 48) (dual of [509, 304, 49]-code), using

• 3 times truncation [i] based on linear OA(2²⁰⁸, 512, F₂, 51) (dual of [512, 304, 52]-code), using
  • an extension C_e(50) of 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]