The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  2
 0  2  0  0  0  0  0  2  0  2  0  2  0  2  0  2  0  2  0  2  0  2  2
 0  0  2  0  0  0  2  2  0  2  0  0  2  0  0  2  2  0  2  0  2  2  0
 0  0  0  2  0  0  2  0  0  2  2  2  2  2  2  2  2  2  2  0  0  2  2
 0  0  0  0  2  0  2  0  2  2  0  2  0  0  2  2  0  0  2  0  2  0  2
 0  0  0  0  0  2  2  0  2  0  2  2  0  2  0  2  2  0  0  2  0  2  0

generates a code of length 23 over Z4 who´s minimum homogenous weight is 20.

Homogenous weight enumerator: w(x)=1x^0+25x^20+32x^22+59x^24+10x^28+1x^44

The gray image is a code over GF(2) with n=46, k=7 and d=20.
This code was found by Heurico 1.16 in 0.00375 seconds.