document.writeln('<ul> <li> <a href="#SEC28">4. Utility Functions</a><ul><li> <a href="#SEC29">4.1 Birth of a Utility</a><li> <a href="#SEC30">4.2 Invest in Abstraction</a><li> <a href="#SEC31">4.3 Operations on Lists</a><li> <a href="#SEC32">4.4 Search</a><li> <a href="#SEC33">4.5 Mapping</a><li> <a href="#SEC34">4.6 I/O</a><li> <a href="#SEC35">4.7 Symbols and Strings</a><li> <a href="#SEC36">4.8 Density</a></ul></ul>');