The generator matrix

 1  0  1  1  1  1  1  1  1  1  X
 0  1 2X+7  8 X+6 X+1 2X  7  0 2X+7 2X
 0  0  6  0  6  3  0  6  3  3  0
 0  0  0  3  6  6  6  3  0  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+432x^18+810x^20+990x^21+972x^22+2592x^23+684x^24+80x^27

The gray image is a code over GF(3) with n=99, k=8 and d=54.
This code was found by Heurico 1.16 in 0.113 seconds.