The generator matrix

 1  1  1  1  1  1  1  1  1  1  1
 0  2  0  0  0  2  2  2 2a  0  2
 0  0  2  0  0 2a^2+2 2a^2+2a+2 2a^2+2a 2a^2+2a  2 2a^2+2
 0  0  0  2  0  2 2a^2+2a+2 2a 2a+2 2a^2  0
 0  0  0  0  2 2a^2+2 2a+2 2a 2a^2+2a+2 2a 2a^2

generates a code of length 11 over GR(64,4) who´s minimum homogenous weight is 48.

Homogenous weight enumerator: w(x)=1x^0+224x^48+1302x^56+2947x^64+9212x^72+229376x^77+11452x^80+7630x^88

The gray image is a code over GF(8) with n=88, k=6 and d=48.
This code was found by Heurico 1.16 in 2.52 seconds.