1. Dynamic, Assert, Retract.

• Tutorial material:
• http://cs.wwc.edu/~cs_dept/KU/PR/Prolog.html
• http://www.guides.sk/prolog/tut/tut16.html

2. .

• flight
• some small functions you can use to program flight example.
• in order to understand some of the functions I given, you can check following website(http://etud.epita.fr:8000/~vigier_n/Prolog/page.php3?chap=5).