The generator matrix

 1  1  1  1  1  1  1  1  1  1  2  2  0  1  0  1  2  1
 0  2  0  0  0  2  6  2  0  0  4  4  4  2  2  0  4  0
 0  0  2  0  2  2  6  0  0  4  6  2  4  6  2  2  6  0
 0  0  0  2  2  0  6  2  4  2  6  0  2  4  2  2  2  4
 0  0  0  0  4  0  0  0  0  0  0  4  4  4  0  4  4  0
 0  0  0  0  0  4  0  4  4  0  4  4  0  4  0  4  4  4
 0  0  0  0  0  0  4  4  0  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+56x^12+88x^13+168x^14+244x^15+432x^16+684x^17+701x^18+712x^19+499x^20+240x^21+145x^22+68x^23+35x^24+12x^25+7x^26+1x^28+3x^30

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 45.8 seconds.