K = {*12341-12-13-14-1}

Symbolics

Substitution:
1->114
2->12131214
3->1213131214
4->1214
Abelianisation:
2 4 5 2
0 2 2 1
0 1 2 0
1 1 1 1

Characteristic polynomial:

(z4 - 7z3 + 13z2 - 7z + 1)

Eigenvalues:

4.3903 0 0 0
0 1.8379 0 0
0 0 0.54411 0
0 0 0 0.22778

Realisations:

Indices:Realisations:
3x2:realisation