The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  X  1  X  X  1  0  1  1  1  1 X^3+X^2  1  1  1  X  X  X
 0  X  0  X  0 X^3 X^2+X  X X^2 X^2+X X^2 X^3+X^2+X X^2 X^3+X^2 X^3+X X^3+X^2+X X^3+X X^2+X X^3 X^2+X  0 X^3+X^2+X X^2+X  X X^2 X^3+X^2 X^3 X^3+X^2  X X^3+X^2  X  X X^3+X  0 X^2+X  X X^3  0
 0  0  X  X X^3+X^2 X^3+X^2+X X^2+X X^2 X^3+X^2 X^3  0 X^3+X^2  X X^2+X X^2+X  X X^3+X X^2+X X^2  0 X^3+X^2+X X^3+X^2 X^2  X  X  0  X X^2 X^2 X^3+X^2+X X^3+X^2+X X^2+X X^3+X^2 X^3+X^2  X X^3+X^2 X^3+X^2+X X^2+X
 0  0  0 X^3  0  0  0 X^3 X^3 X^3 X^3  0 X^3 X^3  0 X^3  0 X^3  0  0 X^3 X^3 X^3  0  0 X^3 X^3  0  0  0  0  0 X^3 X^3 X^3  0 X^3  0
 0  0  0  0 X^3 X^3  0  0  0 X^3 X^3 X^3  0 X^3 X^3 X^3  0  0  0  0 X^3 X^3 X^3 X^3 X^3  0  0 X^3  0  0  0 X^3 X^3  0  0  0 X^3  0

generates a code of length 38 over Z2[X]/(X^4) who´s minimum homogenous weight is 34.

Homogenous weight enumerator: w(x)=1x^0+343x^34+56x^35+757x^36+464x^37+1016x^38+448x^39+591x^40+48x^41+252x^42+8x^43+90x^44+20x^46+1x^50+1x^60

The gray image is a linear code over GF(2) with n=304, k=12 and d=136.
This code was found by Heurico 1.16 in 57.3 seconds.