The generator matrix

 1  0  0  0  1  1  1  1  1
 0  1  0  0  0  1  X  X  0
 0  0  1  0  1  1  1 X+1  0
 0  0  0  1  1  0  0  X  0
 0  0  0  0  X  0  X  0  0
 0  0  0  0  0  X  X  0  0

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+26x^4+52x^5+74x^6+112x^7+150x^8+184x^9+164x^10+112x^11+74x^12+52x^13+18x^14+5x^16

The gray image is a linear code over GF(2) with n=18, k=10 and d=4.
As d=4 is an upper bound for linear (18,10,2)-codes, this code is optimal over Z2[X]/(X^2) for dimension 10.
This code was found by Heurico 1.16 in 0.00294 seconds.