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
 0  X  0  0  0  0  0  0  0  X  X  X  X  X  X  X  0  0  0  0  0  0  0  X  X  X  X  0  X  X  X  X  0  0  0  0  X  X  0  0  X  X
 0  0  X  0  0  0  X  X  X  X  X  0  X  X  0  0  0  0  0  0  X  X  X  X  X  X  0  X  X  0  0  0  0  0  0  X  X  0  0  X  X  0
 0  0  0  X  0  X  X  X  0  0  0  0  X  X  X  X  0  0  X  X  X  X  0  0  0  X  X  0  X  X  0  0  0  0  X  X  0  0  X  X  X  X
 0  0  0  0  X  X  0  X  X  0  X  X  X  0  0  X  0  X  X  0  0  X  X  0  X  X  0  0  0  X  X  0  0  X  X  0  0  0  0  X  X  0

generates a code of length 42 over Z2[X]/(X^2) who´s minimum homogenous weight is 40.

Homogenous weight enumerator: w(x)=1x^0+15x^40+32x^42+15x^44+1x^84

The gray image is a linear code over GF(2) with n=84, k=6 and d=40.
This code was found by Heurico 1.16 in 0.00863 seconds.