The generator matrix

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

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

Homogenous weight enumerator: w(x)=1x^0+105x^12+478x^13+1097x^14+2350x^15+3673x^16+5410x^17+6020x^18+5972x^19+3897x^20+2314x^21+945x^22+334x^23+132x^24+38x^25+2x^26

The gray image is a code over GF(2) with n=72, k=15 and d=24.
This code was found by Heurico 1.11 in 2.22 seconds.