The generator matrix

 1  0  0  0  1  1  1  6  1  1  1  1  2  2  2  1  0  1
 0  1  0  0  0  1  1  1  6  7  4  7  2  1  1  4  4  2
 0  0  1  0  1  1  0  1  0  4  3  1  1  3  2  0  1  5
 0  0  0  1  1  0  1  1  3  6  2  3  3  2  3  5  7  4
 0  0  0  0  4  0  0  0  0  0  4  4  4  0  4  4  4  4
 0  0  0  0  0  4  0  0  4  0  4  4  4  4  0  4  0  4
 0  0  0  0  0  0  4  0  0  0  0  0  4  4  4  4  4  0

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

Homogenous weight enumerator: w(x)=1x^0+147x^12+316x^13+1256x^14+1976x^15+4343x^16+4916x^17+6908x^18+4784x^19+4408x^20+2052x^21+1232x^22+280x^23+120x^24+12x^25+12x^26+5x^28

The gray image is a code over GF(2) with n=72, k=15 and d=24.
This code was found by Heurico 1.16 in 4.01 seconds.