The generator matrix

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

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

Homogenous weight enumerator: w(x)=1x^0+48x^12+156x^13+265x^14+458x^15+682x^16+900x^17+1484x^18+3162x^19+5665x^20+6970x^21+5766x^22+3238x^23+1540x^24+946x^25+620x^26+414x^27+246x^28+114x^29+57x^30+24x^31+9x^32+2x^33+1x^36

The gray image is a code over GF(2) with n=84, k=15 and d=24.
This code was found by Heurico 1.16 in 7.09 seconds.