The generator matrix

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

generates a code of length 18 over Z8 who´s minimum homogenous weight is 12.

Homogenous weight enumerator: w(x)=1x^0+58x^12+144x^14+192x^15+654x^16+576x^17+864x^18+576x^19+628x^20+192x^21+144x^22+64x^24+2x^28+1x^32

The gray image is a code over GF(2) with n=72, k=12 and d=24.
This code was found by Heurico 1.16 in 0.106 seconds.