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# Series
Given a string of digits, output all the contiguous substrings of length `n` in
that string.
For example, the string "49142" has the following 3-digit series:
- 491
- 914
- 142
And the following 4-digit series:
- 4914
- 9142
And if you ask for a 6-digit series from a 5-digit string, you deserve
whatever you get.
Note that these series are only required to occupy *adjacent positions*
in the input; the digits need not be *numerically consecutive*.
## Running the tests
1. Go to the root of your PHP exercise directory, which is `<EXERCISM_WORKSPACE>/php`.
To find the Exercism workspace run
% exercism debug | grep Workspace
1. Get [PHPUnit] if you don't have it already.
% wget --no-check-certificate https://phar.phpunit.de/phpunit.phar
% chmod +x phpunit.phar
2. Execute the tests:
% ./phpunit.phar series/series_test.php
[PHPUnit]: http://phpunit.de
## Source
A subset of the Problem 8 at Project Euler [http://projecteuler.net/problem=8](http://projecteuler.net/problem=8)
## Submitting Incomplete Solutions
It's possible to submit an incomplete solution so you can see how others have completed the exercise.
Version data entries
75 entries across 75 versions & 1 rubygems