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

generates a code of length 70 over Z4[X]/(X^2+2) who´s minimum homogenous weight is 64.

Homogenous weight enumerator: w(x)=1x^0+130x^64+104x^65+250x^66+276x^67+516x^68+500x^69+630x^70+588x^71+433x^72+216x^73+166x^74+84x^75+98x^76+12x^77+52x^78+12x^79+18x^80+4x^82+2x^84+2x^86+1x^88+1x^112

The gray image is a code over GF(2) with n=560, k=12 and d=256.
This code was found by Heurico 1.16 in 0.828 seconds.