The generator matrix

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

generates a code of length 42 over Z2[X]/(X^2) who´s minimum homogenous weight is 33.

Homogenous weight enumerator: w(x)=1x^0+40x^33+119x^34+160x^35+226x^36+232x^37+242x^38+268x^39+290x^40+322x^41+305x^42+322x^43+306x^44+306x^45+254x^46+218x^47+167x^48+110x^49+91x^50+54x^51+28x^52+14x^53+8x^54+2x^55+6x^56+5x^58

The gray image is a linear code over GF(2) with n=84, k=12 and d=33.
This code was found by Heurico 1.16 in 1.28 seconds.