The generator matrix

 1  1  1  1  1  1  1  1  1  X
 0  X 2X  0  3 X+6 X+6  3 X+3 X+6
 0  0  3  3  6  6  0  3  6  0

generates a code of length 10 over Z9[X]/(X^2+6,3X) who´s minimum homogenous weight is 18.

Homogenous weight enumerator: w(x)=1x^0+162x^18+324x^20+216x^21+18x^24+8x^27

The gray image is a code over GF(3) with n=90, k=6 and d=54.
This code was found by Heurico 1.16 in 0.000925 seconds.