The generator matrix

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

generates a code of length 31 over Z4 who´s minimum homogenous weight is 20.

Homogenous weight enumerator: w(x)=1x^0+67x^20+26x^22+276x^24+248x^26+705x^28+668x^30+880x^32+504x^34+469x^36+90x^38+135x^40+23x^44+3x^48+1x^56

The gray image is a code over GF(2) with n=62, k=12 and d=20.
This code was found by Heurico 1.16 in 0.783 seconds.