The generator matrix

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

generates a code of length 73 over Z2[X]/(X^2) who´s minimum homogenous weight is 68.

Homogenous weight enumerator: w(x)=1x^0+13x^68+15x^70+35x^72+128x^73+35x^74+15x^76+13x^78+1x^146

The gray image is a linear code over GF(2) with n=146, k=8 and d=68.
This code was found by Heurico 1.16 in 0.0821 seconds.