The generator matrix

 1  0  0  0  0  0  1  1  1  2  1  1  1  2  1  1  1  1  1  1  0  1  0  1  1  1  2  1  1  1  2  1  2  2  1  1  0  1  1  1  2  0  1  0  1  2  1  2  1
 0  1  0  0  0  0  0  0  0  0  2  1  3  1  2  0  3  3  3  3  1  0  2  3  2  2  1  1  3  0  0  2  1  1  0  1  1  1  1  2  2  0  2  1  1  0  3  2  0
 0  0  1  0  0  0  0  0  0  0  3  2  1  1  1  3  1  0  2  3  0  1  1  2  2  0  1  2  0  2  1  1  3  0  1  2  3  1  2  3  1  1  3  3  0  1  2  1  0
 0  0  0  1  0  0  2  1  3  1  1  3  2  1  1  1  1  1  3  3  3  2  3  3  2  3  3  2  0  3  2  0  1  1  1  1  1  2  1  3  1  3  3  2  3  2  1  1  0
 0  0  0  0  1  0  3  1  2  3  0  0  0  0  0  3  3  1  2  0  0  1  2  1  2  2  0  3  3  3  3  2  3  1  2  3  1  3  0  2  3  1  3  1  1  1  0  0  0
 0  0  0  0  0  1  1  2  3  3  0  0  0  0  1  2  3  0  1  2  1  3  0  3  3  2  3  2  1  3  3  1  3  0  2  0  2  3  3  0  2  3  1  0  2  1  2  0  0

generates a code of length 49 over Z4 who´s minimum homogenous weight is 40.

Homogenous weight enumerator: w(x)=1x^0+142x^40+380x^42+492x^44+546x^46+518x^48+554x^50+514x^52+422x^54+300x^56+130x^58+74x^60+16x^62+7x^64

The gray image is a code over GF(2) with n=98, k=12 and d=40.
This code was found by Heurico 1.16 in 1.54 seconds.