The generator matrix

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

generates a code of length 7 over Z4[X]/(X^2+2) who´s minimum homogenous weight is 4.

Homogenous weight enumerator: w(x)=1x^0+18x^4+32x^5+13x^6+384x^7+13x^8+32x^9+18x^10+1x^14

The gray image is a code over GF(2) with n=56, k=9 and d=16.
This code was found by Heurico 1.16 in 1.05e-007 seconds.