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The motor is attached to digital pins 8 - 11 of Arduino.
On their site us a chart with the pins to be inserted.
There are some issues with stepper motors like users have no options where to set the stepper to begin without elaborate hardware additions.
There are several common shapes used, in addition, the shaft length can be important for obvious reasons.
This will cause a short circuit and possible damage to the device.
This allows you to easily control 2 or more stepper motors at the same time.
Techref has a good description of.