Examples
Let's take a list of submissions and draw up examples of position intervals.
Submissions (first to most recent): [0,1,2,3,4,5,6,7,8,9]
[0:4] : This Position range will find the first four submissions or submissions [0,1,2,3].
[:4] : This Position range will find the first four submissions or submissions [0,1,2,3].
[-3:-1] : This Position range will find the second and third to the last submission or submissions [7,8].
[-3:] : This Position range will find the last three submissions or submissions [7,8,9].