The generator matrix

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

generates a code of length 20 over Z9[X]/(X^2+3,3X) who´s minimum homogenous weight is 30.

Homogenous weight enumerator: w(x)=1x^0+48x^30+36x^31+268x^33+90x^34+216x^35+1098x^36+360x^37+3240x^38+2940x^39+450x^40+6480x^41+3042x^42+396x^43+270x^44+492x^45+126x^46+90x^48+36x^51+2x^54+2x^60

The gray image is a code over GF(3) with n=180, k=9 and d=90.
This code was found by Heurico 1.16 in 0.458 seconds.