TODO

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## HINTS

Boilerplate TODO:

```js
var d3 = require('d3');

module.exports = function(frequencies) {
    // TODO
};
```

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In the previous parts of this tutorial we made a basic bar chart in HTML and then in SVG; now, we’ll improve the display by rotating the chart into columns and adding axes. We’ll also switch to a real dataset, showing the relative frequency of letters in the English language.

----------------------------------------------------------------------

## HINTS

Boilerplate TODO:

```js
var d3 = require('d3');

module.exports = function(frequencies) {
    // TODO
};
```

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Add introduction for part 3
Add introduction for part 3
