The generator matrix

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

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

Homogenous weight enumerator: w(x)=1x^0+321x^12+784x^13+2182x^14+4440x^15+7579x^16+11104x^17+12504x^18+11280x^19+7781x^20+4400x^21+2094x^22+728x^23+283x^24+32x^25+20x^26+2x^28+1x^32

The gray image is a code over GF(2) with n=72, k=16 and d=24.
This code was found by Heurico 1.11 in 7.81 seconds.