The generator matrix

 1  1  1  1  1  1  2  0  1  1  2  1  1  0  1  1  2  1  2  2  1
 0  2  0  6  0  6  2  2  0  6  2  0  4  2  6  6  0  6  6  6  6
 0  0  4  0  0  0  0  0  0  0  0  0  4  0  0  0  4  4  4  0  4
 0  0  0  4  0  0  0  0  0  0  0  0  0  0  0  4  4  4  0  4  4
 0  0  0  0  4  0  0  0  0  0  0  0  4  0  4  4  0  4  4  0  0
 0  0  0  0  0  4  0  0  0  0  0  0  0  4  4  0  4  4  0  4  0
 0  0  0  0  0  0  4  0  0  0  0  4  4  4  0  0  4  0  4  0  0
 0  0  0  0  0  0  0  4  0  0  0  4  4  4  0  0  0  0  0  4  4
 0  0  0  0  0  0  0  0  4  0  0  4  0  0  4  4  0  4  0  0  4
 0  0  0  0  0  0  0  0  0  4  0  4  4  0  0  4  4  0  0  4  0
 0  0  0  0  0  0  0  0  0  0  4  4  4  4  4  4  4  4  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+134x^12+64x^14+826x^16+256x^17+832x^18+2048x^19+2406x^20+3584x^21+1728x^22+2048x^23+1432x^24+256x^25+448x^26+274x^28+45x^32+2x^36

The gray image is a code over GF(2) with n=84, k=14 and d=24.
This code was found by Heurico 1.16 in 1.78 seconds.