The generator matrix

 1  0  1  1  1  1  1  0  1  1  1  1
 0  1  1  8  0  7  8  1  0  0  3  3
 0  0  6  0  0  6  6  3  0  3  6  3
 0  0  0  3  0  6  0  6  6  6  6  3
 0  0  0  0  3  6  3  6  3  3  0  6

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

Homogenous weight enumerator: w(x)=1x^0+108x^18+162x^20+168x^21+648x^23+180x^24+648x^26+152x^27+120x^30

The gray image is a code over GF(3) with n=36, k=7 and d=18.
This code was found by Heurico 1.16 in 0.0102 seconds.