The generator matrix

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

generates a code of length 28 over Z8 who´s minimum homogenous weight is 20.

Homogenous weight enumerator: w(x)=1x^0+29x^20+66x^24+128x^26+256x^27+70x^28+256x^29+128x^30+60x^32+25x^36+4x^44+1x^48

The gray image is a code over GF(2) with n=112, k=10 and d=40.
This code was found by Heurico 1.16 in 0.0282 seconds.