<wob_jonas> perl -eopen$i,"<",($f="wisdom/aristotle");$_=<$i>; s/find fifth/find the fifth/ or die; if (1) { open$o,">",$f; print$o $_ or die; } print substr$_,0;

Lystrosaurus is a genus of Late Permian and Early Triassic Period dicynodont therapsids, which ruled the world around 250 million years ago.