The generator matrix

 1  0  0  0  1  1  1  1  1  1  1  1  1 2a  1  1  1  1  1 2a+2  1  1  1  2  1  1  1  1  1  2  1  1  2  1  1  1  1  0  1  1  1  2  1  1  1  1  1 2a  1  1 2a  1  1  1  1  1  2  1  1  1 2a+2  1  1  1  1  1  2  1  1  1  1  1  1  1
 0  1  0  0 2a+2  0 2a+2  1 3a+2 2a+3  3  3 a+3  1 3a a+1 2a+1  2 2a+1  1 3a+1 a+3 3a+1  1 a+1  a  2 2a+3  3  1 2a+2 2a+1  1  0 2a+3 a+3  2  1  a  2 2a+2  1 3a+2 a+2 2a+3  a 2a+1  1 2a+3 a+2  1 3a 2a a+1 2a 2a+1  0 a+2 3a+3  a  2 3a+3 2a+3 3a 3a+3  2  1 3a+1  0  1 2a+2 3a+2  0 3a+1
 0  0  1  0  2 2a+2  0 2a 2a 2a+2 2a+2 2a  2 3a+2 2a+3 3a 2a+1 a+1 a+3  1 3a+2 2a+3 2a+1  3 3a+3 a+2  a 3a+2 a+2 3a+3 3a+1 a+2 a+1 3a 2a+1 3a+3 2a+3  2 a+1  3 3a 3a+2 3a+3 a+2 3a+1  3 a+1  3 a+2  a  a 3a+3  3 3a+1 a+3 2a+1  1  0 3a  1  1 2a  2 2a+1 2a+1  2 3a+1  a 3a+1  2 2a+2  0 a+1 3a+3
 0  0  0  1 2a+3 3a+2 3a+3 3a+1 a+1 3a 2a+2  3  a 2a+3 2a a+3 2a+3 3a+1  3 2a+1  1  2 a+3 a+1 a+2 3a+2  0 3a+1  1 2a+3 a+2 3a 3a+1  3 2a  0 2a+3 a+1  1 a+3 3a a+2 2a  3 2a+2 a+1 a+3  a  2 2a+2 3a+3  a 2a  1 2a+2 3a+2 2a+3  2 a+2 a+2  0  2 a+2 3a+3  1 2a 2a+2  3  1  3 a+1  3  a 3a

generates a code of length 74 over GR(16,4) who´s minimum homogenous weight is 206.

Homogenous weight enumerator: w(x)=1x^0+324x^206+732x^207+513x^208+828x^209+2040x^210+1776x^211+1293x^212+1404x^213+3084x^214+2556x^215+1932x^216+2124x^217+4044x^218+3036x^219+2118x^220+2304x^221+4140x^222+3660x^223+2208x^224+2472x^225+3900x^226+3132x^227+1983x^228+1836x^229+3312x^230+2220x^231+1230x^232+972x^233+1728x^234+1068x^235+375x^236+312x^237+420x^238+240x^239+108x^240+36x^241+48x^242+12x^243+12x^244+3x^252

The gray image is a code over GF(4) with n=296, k=8 and d=206.
This code was found by Heurico 1.16 in 23.1 seconds.