Further examples of non-orientable compact hyperbolic 4-manifolds of volume 32π 2 /3 arising from torsion-free subgroups of the [5, 3, 3, 3] Coxeter group are given. These are the smallest known closed hyperbolic 4-manifolds and arise by consideration of maps from the [5,3,3,3] Coxeter group onto the simple simplectic group S4(4).
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