The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  1  X  X  1  1
 0  X  0  0  0  0  0  X  X 2X  X 2X 3X 2X  X  X  0  0
 0  0  X  0  0  0  X 3X 3X  0 4X 3X 2X 4X 2X  0  0  X
 0  0  0  X  0  0 3X 3X 4X 4X 4X  X 3X  0 2X  X 4X 4X
 0  0  0  0  X  0 3X 4X  X  X 3X  0  X 4X 2X  0 2X  0
 0  0  0  0  0  X 3X  X 2X 3X  0 3X 3X 4X  X 2X 4X 3X

generates a code of length 18 over Z5[X]/(X^2) who´s minimum homogenous weight is 50.

Homogenous weight enumerator: w(x)=1x^0+220x^50+764x^55+1128x^60+2500x^64+2240x^65+20000x^69+3380x^70+40000x^74+3644x^75+2736x^80+1232x^85+280x^90

The gray image is a linear code over GF(5) with n=90, k=7 and d=50.
This code was found by Heurico 1.16 in 4.07 seconds.