The generator matrix

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

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

Homogenous weight enumerator: w(x)=1x^0+116x^12+190x^14+128x^15+575x^16+384x^17+1286x^18+384x^19+614x^20+128x^21+186x^22+96x^24+2x^26+6x^28

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 0.139 seconds.