<wob_jonas> perl -eopen$i,"<",($f="wisdom/aristotle");$_=<$i>; s/, even though.*\\. / without checking. / or die; if (1) { open$o,">",$f; print$o $_ or die; } print substr$_,0;

Bessel functions are responsible for certain surprising and hard to understand compilation errors. You may have seen them if you tried to define a global named yn or j0.