The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  2  0  2  1  1  2  0  2  1  0  1  1  0  1
 0  2  0  2  0  0  2  6  0  4  6  2  4  0  2  4  2  2  0  6  6  2  4  6  4  6
 0  0  2  2  0  6  2  0  4  2  0  2  2  2  2  2  6  2  2  4  6  0  0  2  2  0
 0  0  0  4  0  0  0  0  4  4  4  4  0  0  0  4  0  4  0  0  4  0  0  4  4  0
 0  0  0  0  4  0  0  0  0  0  0  4  0  0  0  4  4  4  0  4  0  4  4  4  4  0
 0  0  0  0  0  4  0  0  0  4  0  0  0  4  4  4  4  0  4  4  0  4  0  4  0  0
 0  0  0  0  0  0  4  0  4  4  4  4  0  0  4  4  4  0  4  0  4  4  4  4  0  4
 0  0  0  0  0  0  0  4  0  0  0  4  4  4  0  4  4  4  4  0  0  0  0  0  4  4

generates a code of length 26 over Z8 who´s minimum homogenous weight is 20.

Homogenous weight enumerator: w(x)=1x^0+211x^20+330x^22+927x^24+1138x^26+988x^28+318x^30+151x^32+6x^34+25x^36+1x^40

The gray image is a code over GF(2) with n=104, k=12 and d=40.
This code was found by Heurico 1.16 in 62.2 seconds.