The generator matrix

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

generates a code of length 11 over Z9[X]/(X^2+6,3X) who´s minimum homogenous weight is 18.

Homogenous weight enumerator: w(x)=1x^0+24x^18+54x^20+36x^21+486x^22+108x^23+2x^27+18x^30

The gray image is a code over GF(3) with n=99, k=6 and d=54.
This code was found by Heurico 1.16 in 0.000795 seconds.