$ and prove it aspherical provided the subgroup
of $G$ generated by $\{ ab^{-1}, bc^{-1}, cd^{-1}, de^{-1}\}$ is
neither finite cyclic nor a finite triangle group. We also prove a
similar result for the closely related relative group presentation
$\$.
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Full text: http://www.ma.hw.ac.uk/~jim/preprint9.ps.Z
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