The generator matrix

 1  0  1  1  1  1  1 X+6  1  1 2X  1  1 X+6  0  1  1  1  1  1
 0  1 2X+7  8 X+6 X+1 X+5  1 2X  7  1 2X+8  0  1  1 2X+7 X+6 2X+7  8  0
 0  0  6  0  0  0  6  6  3  3  3  0  3  0  3  3  0  3  0  3
 0  0  0  3  0  0  6  6  6  6  0  6  6  6  0  6  0  0  3  0
 0  0  0  0  6  0  3  6  6  0  3  3  0  0  0  3  3  6  6  6
 0  0  0  0  0  3  0  3  6  3  3  6  6  6  0  3  6  6  6  3

generates a code of length 20 over Z9[X]/(X^2+6,3X) who´s minimum homogenous weight is 30.

Homogenous weight enumerator: w(x)=1x^0+64x^30+24x^31+18x^32+272x^33+456x^34+144x^35+2456x^36+2256x^37+9180x^38+8876x^39+4350x^40+18072x^41+8870x^42+3000x^43+288x^44+482x^45+120x^46+74x^48+38x^51+4x^54+4x^57

The gray image is a code over GF(3) with n=180, k=10 and d=90.
This code was found by Heurico 1.16 in 1.99 seconds.