The generator matrix

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

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

Homogenous weight enumerator: w(x)=1x^0+61x^12+362x^13+556x^14+1120x^15+1966x^16+2606x^17+2990x^18+2608x^19+2057x^20+1190x^21+480x^22+272x^23+73x^24+34x^25+6x^26+2x^28

The gray image is a code over GF(2) with n=72, k=14 and d=24.
This code was found by Heurico 1.16 in 1.25 seconds.