The generator matrix

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

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

Homogenous weight enumerator: w(x)=1x^0+74x^12+130x^13+272x^14+544x^15+1001x^16+2384x^17+4108x^18+7482x^19+10901x^20+11658x^21+10924x^22+7578x^23+4154x^24+2326x^25+1028x^26+510x^27+240x^28+140x^29+52x^30+14x^31+12x^32+2x^33+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 19.2 seconds.