The generator matrix

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

generates a code of length 11 over Z9 who´s minimum homogenous weight is 18.

Homogenous weight enumerator: w(x)=1x^0+180x^18+180x^21+306x^24+62x^27

The gray image is a code over GF(3) with n=33, k=6 and d=18.
This code was found by Heurico 1.16 in 0.00575 seconds.