The generator matrix

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

generates a code of length 50 over Z4[X]/(X^2+2) who´s minimum homogenous weight is 47.

Homogenous weight enumerator: w(x)=1x^0+590x^47+708x^48+678x^49+609x^50+522x^51+279x^52+362x^53+141x^54+120x^55+50x^56+24x^57+1x^58+8x^59+1x^60+1x^62+1x^64

The gray image is a code over GF(2) with n=400, k=12 and d=188.
This code was found by Heurico 1.16 in 11.6 seconds.