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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 tests In order to run the tests, issue the following command from the exercise directory: For running the tests provided, `rebar3` is used as it is the official build and dependency management tool for erlang now. Please refer to [the tracks installation instructions](http://exercism.io/languages/erlang/installation) on how to do that. In order to run the tests, you can issue the following command from the exercise directory. ```bash $ rebar3 eunit ``` ### Test versioning Each problem defines a macro `TEST_VERSION` in the test file and verifies that the solution defines and exports a function `test_version` returning that same value. To make tests pass, add the following to your solution: ```erlang -export([test_version/0]). test_version() -> 1. ``` The benefit of this is that reviewers can see against which test version an iteration was written if, for example, a previously posted solution does not solve the current problem or passes current tests. ## Questions? For detailed information about the Erlang track, please refer to the [help page](http://exercism.io/languages/erlang) on the Exercism site. This covers the basic information on setting up the development environment expected by the exercises. ## 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.
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