The generator matrix

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

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

Homogenous weight enumerator: w(x)=1x^0+153x^12+276x^14+64x^15+1582x^16+640x^17+3248x^18+1984x^19+7193x^20+2816x^21+6520x^22+1984x^23+3848x^24+640x^25+1200x^26+64x^27+491x^28+20x^30+41x^32+3x^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 4.88 seconds.