The generator matrix
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 X X X X X X X 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 X X X X X X X X 0 0 0 0 0 0 0 1 1 1 1 X 1 1 1 1 1
0 X 0 0 0 X X X 0 0 0 X 0 X X X 0 0 0 X 0 X X X 0 0 X X 0 X X X X X X 0 0 0 0 0 0 X 0 X X X 0 0 X X 0 X X 0 X X X X 0 0 0 0 0 0 X 0 0 X X X 0
0 0 X 0 X X X 0 0 0 X X X X 0 0 0 0 X X X X 0 0 0 X X 0 X X 0 0 0 X X X X 0 0 0 X X X X 0 0 0 X X 0 X X 0 0 0 0 X X X X 0 0 0 X X 0 X X 0 0 0
0 0 0 X X 0 X X 0 X X 0 0 X X 0 0 X X 0 0 X X 0 X X 0 0 0 X X 0 X X 0 0 X X 0 X X 0 0 X X 0 X X 0 0 0 X X 0 0 X X 0 0 X X 0 X X 0 0 0 X X 0 0
generates a code of length 71 over Z2[X]/(X^2) who´s minimum homogenous weight is 72.
Homogenous weight enumerator: w(x)=1x^0+7x^72+16x^73+7x^74+1x^82
The gray image is a linear code over GF(2) with n=142, k=5 and d=72.
As d=72 is an upper bound for linear (142,5,2)-codes, this code is optimal over Z2[X]/(X^2) for dimension 5.
This code was found by Heurico 1.16 in 0.0559 seconds.