The generator matrix

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

generates a code of length 18 over Z4 who´s minimum homogenous weight is 8.

Homogenous weight enumerator: w(x)=1x^0+78x^8+16x^9+224x^10+208x^11+676x^12+1024x^13+1872x^14+2688x^15+3332x^16+4256x^17+4032x^18+4256x^19+3320x^20+2688x^21+1824x^22+1024x^23+746x^24+208x^25+224x^26+16x^27+36x^28+16x^30+3x^32

The gray image is a code over GF(2) with n=36, k=15 and d=8.
This code was found by Heurico 1.16 in 4.11 seconds.