# Isogram

Determine if a word or phrase is an isogram.

An isogram (also known as a "nonpattern word") is a word or phrase without a repeating letter, however spaces and hyphens are allowed to appear multiple times.

Examples of isograms:

- lumberjacks
- background
- downstream
- six-year-old

The word *isograms*, however, is not an isogram, because the s repeats.

# Java Tips

If you find that `testWorksWithGermanLetters` fails even though you think you've implemented it correctly,
this could be because of the [JVM encoding](https://www.ibm.com/support/knowledgecenter/en/ssw_ibm_i_61/rzaha/international.htm). 
Try setting the `JAVA_TOOL_OPTIONS` environment variable to `-Dfile.encoding=UTF8` to fix this.
- To set an environment variable on Windows:
    1. Go to Computer -> Properties -> Advanced System Settings
    2. Add a new environment variable

- [To set an environment variable on a mac](http://blog.lidalia.org.uk/2011/04/setting-default-java-file-encoding-to.html)

- [To set an environment variable on linux](https://unix.stackexchange.com/questions/151733/where-can-i-set-global-java-options)

# Running the tests

You can run all the tests for an exercise by entering

```sh
$ gradle test
```

in your terminal.

## Source

Wikipedia [https://en.wikipedia.org/wiki/Isogram](https://en.wikipedia.org/wiki/Isogram)

## Submitting Incomplete Solutions

It's possible to submit an incomplete solution so you can see how others have completed the exercise.