The generator matrix

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

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+414x^33+72x^34+72x^35+2014x^36+432x^37+918x^38+4308x^39+3294x^40+1836x^41+4428x^42+576x^43+90x^44+1126x^45+102x^48

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 0.455 seconds.