The generator matrix
1 0 1 1 1 X 1 1 0 1 1 X 1 1 0 1 1 X 1 1 0 1 1 X 1 1 1 1 0 X 1 1 1 1 0 X 1 1 1 1 0 X 1 1 1 1 0 X X X 0 1 1 1 1 0 X X X 0 1 1 X X 0 1 1 0 X X X 0 1 1 1 1 0 X X X 0 1 1 1 1
0 1 X+1 X 1 1 0 X+1 1 X 1 1 0 X+1 1 X 1 1 0 X+1 1 X 1 1 0 X X+1 1 1 1 0 X X+1 1 1 1 0 X X+1 1 1 1 0 X X+1 1 1 1 0 X X 0 X X+1 1 1 1 0 X X 0 X 0 X X X+1 1 1 1 0 X X 0 X X+1 1 1 1 0 X X 0 X X+1 1
generates a code of length 85 over Z2[X]/(X^2) who´s minimum homogenous weight is 90.
Homogenous weight enumerator: w(x)=1x^0+12x^90+2x^92+1x^96
The gray image is a linear code over GF(2) with n=170, k=4 and d=90.
As d=90 is an upper bound for linear (170,4,2)-codes, this code is optimal over Z2[X]/(X^2) for dimension 4.
This code was found by Heurico 1.16 in 0.108 seconds.