The generator matrix

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

generates a code of length 7 over Z2[X]/(X^4) who´s minimum homogenous weight is 4.

Homogenous weight enumerator: w(x)=1x^0+109x^4+160x^5+904x^6+1728x^7+939x^8+160x^9+88x^10+7x^12

The gray image is a linear code over GF(2) with n=56, k=12 and d=16.
This code was found by Heurico 1.16 in 0 seconds.