The generator matrix

 1  1  1  1  1  1  1  1  1  2  0  1  2  1  1  2  0  2  0  4  1
 0  2  0  6  0  6  0  6  4  6  2  4  6  4  4  6  2  2  2  2  0
 0  0  4  0  0  4  4  4  4  0  0  0  4  4  0  4  0  0  4  4  0
 0  0  0  4  4  4  4  0  0  0  4  4  4  4  0  0  0  4  4  0  0

generates a code of length 21 over Z8 who´s minimum homogenous weight is 19.

Homogenous weight enumerator: w(x)=1x^0+40x^19+14x^20+16x^21+14x^22+40x^23+1x^24+1x^26+1x^34

The gray image is a code over GF(2) with n=84, k=7 and d=38.
This code was found by Heurico 1.16 in 0.128 seconds.