The generator matrix

 1  0  0  0  0  1  1  1  4  1  1  1  1  2  1  1  2  1
 0  1  0  0  0  4  1  3  1  2  6  0  7  4  1  7  1  4
 0  0  1  0  0  7  3  2  7  5  0  6  4  4  1  1  5  4
 0  0  0  1  0  1  2  5  5  7  6  7  5  1  1  2  7  4
 0  0  0  0  1  1  4  4  6  0  3  6  3  3  7  1  3  2

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

Homogenous weight enumerator: w(x)=1x^0+83x^12+460x^13+1094x^14+2358x^15+3711x^16+5572x^17+6012x^18+5748x^19+3919x^20+2332x^21+923x^22+390x^23+126x^24+36x^25+2x^26+1x^30

The gray image is a code over GF(2) with n=72, k=15 and d=24.
This code was found by Heurico 1.16 in 4.63 seconds.