The generator matrix

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

generates a code of length 18 over Z8 who´s minimum homogenous weight is 12.

Homogenous weight enumerator: w(x)=1x^0+126x^12+208x^14+1025x^16+1376x^18+1025x^20+208x^22+126x^24+1x^36

The gray image is a code over GF(2) with n=72, k=12 and d=24.
This code was found by Heurico 1.16 in 40.3 seconds.