The generator matrix

 1  1  1  1  1  1  1  1  1  3  3  1
 0  3  0  0  0  3  0  6  6  3  3  0
 0  0  3  0  0  6  3  0  6  6  3  0
 0  0  0  3  0  6  3  6  0  3  6  0
 0  0  0  0  3  3  3  3  6  0  6  0

generates a code of length 12 over Z9 who´s minimum homogenous weight is 18.

Homogenous weight enumerator: w(x)=1x^0+60x^18+54x^20+72x^21+216x^23+216x^26+20x^27+90x^30

The gray image is a code over GF(3) with n=36, k=6 and d=18.
This code was found by Heurico 1.16 in 0.00233 seconds.