The generator matrix

 1  0  1  1  1  0  1  1  0  1  1  0  2  2  2  1  1  1  1  1  1
 0  1  1  0  1  1  3  0  1  6  5  1  4  0  1  0  5  4  2  4  0
 0  0  2  0  0  0  0  6  6  2  2  2  0  2  2  2  2  4  0  0  0
 0  0  0  2  0  6  2  6  6  0  2  0  2  4  4  2  4  4  0  4  0
 0  0  0  0  2  0  2  6  6  2  0  2  4  6  0  4  2  6  6  2  0
 0  0  0  0  0  4  0  0  0  0  0  4  4  4  0  4  0  0  4  4  0
 0  0  0  0  0  0  4  0  0  0  4  0  4  0  4  0  4  0  4  0  0
 0  0  0  0  0  0  0  4  0  4  0  0  0  4  4  4  0  4  0  4  0
 0  0  0  0  0  0  0  0  4  4  4  0  4  4  4  4  0  0  4  4  0

generates a code of length 21 over Z8 who´s minimum homogenous weight is 12.

Homogenous weight enumerator: w(x)=1x^0+81x^12+160x^13+314x^14+500x^15+1429x^16+2240x^17+4747x^18+7528x^19+9795x^20+11968x^21+9840x^22+7344x^23+4738x^24+2432x^25+1434x^26+472x^27+323x^28+96x^29+46x^30+28x^31+16x^32+3x^34+1x^36

The gray image is a code over GF(2) with n=84, k=16 and d=24.
This code was found by Heurico 1.16 in 17 seconds.