The generator matrix

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

generates a code of length 20 over Z9[X]/(X^2+6,3X) who´s minimum homogenous weight is 34.

Homogenous weight enumerator: w(x)=1x^0+108x^34+96x^35+250x^36+144x^37+156x^38+202x^39+4806x^40+90x^41+76x^42+216x^43+102x^44+178x^45+72x^46+42x^47+20x^48+2x^60

The gray image is a code over GF(3) with n=180, k=8 and d=102.
This code was found by Heurico 1.16 in 1.89 seconds.