The generator matrix

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

generates a code of length 5 over Z2[X]/(X^2) who´s minimum homogenous weight is 2.

Homogenous weight enumerator: w(x)=1x^0+45x^2+210x^4+210x^6+45x^8+1x^10

The gray image is a linear code over GF(2) with n=10, k=9 and d=2.
As d=2 is an upper bound for linear (10,9,2)-codes, this code is optimal over Z2[X]/(X^2) for dimension 9.
This code was found by Heurico 1.16 in 0.000244 seconds.