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

generates a code of length 71 over Z2[X]/(X^2) who´s minimum homogenous weight is 74.

Homogenous weight enumerator: w(x)=1x^0+6x^74+6x^76+2x^78+1x^80

The gray image is a linear code over GF(2) with n=142, k=4 and d=74.
This code was found by Heurico 1.16 in 0.0836 seconds.