The JDisplay Java Applet
displays the large program listings on this web page.
JDisplay requires an up-to-date
browser and Java version
1.8+, preferably 1.8.0_121.
If you can’t see the listings, or if you just want to learn
more about JDisplay, click
Use Firefox for best results.
If you take a set of objects and rearrange the order without taking any away or
adding any, that is a permutation of the orginal set of objects. Permutations care
about order where combinations do not. If you have n
objects there are n! possible permutations of them.