The generator matrix

 1  1  1  1  1  1  1  1  X
 0  X  0  0  0  0  0  0  X
 0  0  X  0  0  0  0  0  X
 0  0  0  X  0  0  0  0  X
 0  0  0  0  X  0  0  0  X
 0  0  0  0  0  X  0  0  X
 0  0  0  0  0  0  X  0  X
 0  0  0  0  0  0  0  X  X

generates a code of length 9 over Z2[X]/(X^2) who´s minimum homogenous weight is 4.

Homogenous weight enumerator: w(x)=1x^0+36x^4+254x^8+128x^10+84x^12+9x^16

The gray image is a linear code over GF(2) with n=18, k=9 and d=4.
This code was found by Heurico 1.16 in -3.24e-008 seconds.