The generator matrix

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

generates a code of length 20 over Z9[X]/(X^2+6,3X) who´s minimum homogenous weight is 33.

Homogenous weight enumerator: w(x)=1x^0+74x^33+150x^34+1410x^36+264x^37+1944x^38+5400x^39+576x^40+3888x^41+5384x^42+372x^43+84x^45+96x^46+18x^48+14x^51+8x^54

The gray image is a code over GF(3) with n=180, k=9 and d=99.
This code was found by Heurico 1.16 in 0.262 seconds.