The generator matrix

 1  0  0  1  1  1  1  1  1  1  1  1
 0  1  0  1  0  6  8  3  7  7  5  0
 0  0  1  8  8  7  2  5  6  6  7  8
 0  0  0  6  3  0  6  3  6  3  6  3

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

Homogenous weight enumerator: w(x)=1x^0+148x^18+60x^19+54x^20+244x^21+144x^22+216x^23+352x^24+180x^25+216x^26+400x^27+102x^28+62x^30+8x^33

The gray image is a code over GF(3) with n=36, k=7 and d=18.
This code was found by Heurico 1.13 in 0 seconds.