The generator matrix

 1  0  1  1  1  0  1  1  2  1  1  6  1  2  2  1  1  1  1  1  1
 0  1  1  0  3  1  2  3  1  6  5  1  0  4  2  3  4  7  0  3  0
 0  0  2  6  0  6  2  6  2  0  0  0  4  2  2  0  2  2  0  0  0
 0  0  0  4  0  0  0  0  0  0  4  4  0  0  4  0  0  4  0  4  0
 0  0  0  0  4  0  0  0  0  0  4  0  0  4  4  0  4  0  4  0  0
 0  0  0  0  0  4  0  0  0  0  4  0  4  4  0  4  4  4  4  0  4
 0  0  0  0  0  0  4  0  0  0  4  4  0  4  0  4  0  4  0  0  4
 0  0  0  0  0  0  0  4  0  0  0  4  4  4  0  0  4  4  0  0  4
 0  0  0  0  0  0  0  0  4  0  4  0  4  0  4  4  4  4  0  4  4
 0  0  0  0  0  0  0  0  0  4  0  0  4  4  4  0  0  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+38x^12+24x^13+173x^14+240x^15+513x^16+1216x^17+1745x^18+5136x^19+3641x^20+7248x^21+3706x^22+5136x^23+1782x^24+1216x^25+490x^26+240x^27+160x^28+24x^29+25x^30+8x^32+5x^34+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 4.17 seconds.