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# Dominoes
Make a chain of dominoes.
Compute a way to order a given set of dominoes in such a way that they form a
correct domino chain (the dots on one half of a stone match the dots on the
neighbouring half of an adjacent stone) and that dots on the halfs of the stones
which don't have a neighbour (the first and last stone) match each other.
For example given the stones `[2|1]`, `[2|3]` and `[1|3]` you should compute something
like `[1|2] [2|3] [3|1]` or `[3|2] [2|1] [1|3]` or `[1|3] [3|2] [2|1]` etc, where the first and last numbers are the same.
For stones `[1|2]`, `[4|1]` and `[2|3]` the resulting chain is not valid: `[4|1] [1|2] [2|3]`'s first and last numbers are not the same. 4 != 3
Some test cases may use duplicate stones in a chain solution, assume that multiple Domino sets are being used.
## Exception messages
Sometimes it is necessary to raise an exception. When you do this, you should include a meaningful error message to
indicate what the source of the error is. This makes your code more readable and helps significantly with debugging. Not
every exercise will require you to raise an exception, but for those that do, the tests will only pass if you include
a message.
To raise a message with an exception, just write it as an argument to the exception type. For example, instead of
`raise Exception`, you shold write:
```python
raise Exception("Meaningful message indicating the source of the error")
```
## Submitting Exercises
Note that, when trying to submit an exercise, make sure the solution is in the `exercism/python/<exerciseName>` directory.
For example, if you're submitting `bob.py` for the Bob exercise, the submit command would be something like `exercism submit <path_to_exercism_dir>/python/bob/bob.py`.
For more detailed information about running tests, code style and linting,
please see the [help page](http://exercism.io/languages/python).
## 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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