The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  X  X  1  1  X  1  X  X  X
 0  6  3  0  6  3  0  6  3  0  6  3  6  3  0  6  0  3  6  3  0

generates a code of length 21 over Z9[X]/(X^2+3,3X) who´s minimum homogenous weight is 42.

Homogenous weight enumerator: w(x)=1x^0+72x^42+2x^45+6x^48

The gray image is a code over GF(3) with n=189, k=4 and d=126.
This code was found by Heurico 1.16 in 0.00164 seconds.