 index by key can be normally deallocated by garbage
collector. So in this case special care is not needed.<P>


<H2><A NAME = "distribution">Distribution terms</A></H2>
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the <A HREF="#Software">Software</A>), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the 