Thanks, this helps.
Developer notes says:
Since this page is based on a template, you don't have to copy the Developer Notes to a new PHP page to view this content. Instead, add the following line to the end of the URL for the page that displays the template's content.
The address/URL to view this content should look something like this:
What is the logic for future posts. I have a client who will post hundreds of pages based on this template. Do i keep adding another number to the end?
I added another page based on this template, and now 2 is the same, and 3 is different.