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## 15.4. Identifiers

When you reference parts of the pattern, you do so by naming them. The names you give the different parts are called identifiers.

In this example:

    START n=node(1) MATCH n-->b RETURN b

The identifiers are `n` and `b`.

Identifier names are case sensitive, and can contain underscores and alphanumeric characters (a-z, 0-9), but must start with a letter. If other characters are needed, you can quote the identifier using backquote (```) signs.

The same rules apply to property names.

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