Both are widespread use in colloquial usage. Mature themes such as alcohol consumption, drug usage, and sex are present. Other users report experiencing disc scratching during normal horizontal usage. However, some have fees associated with continued usage or access to additional features. Mainstream media usage of Web 2.0 is increasing. It is very similar to certain forms of the voulge in design and usage. There are several definitions that vary by technical versus layman's usage. There are some issues in regards to current robotic surgery usage in clinical applications. The usage and handling of various selections is not standardized. This includes increased patron usage and dwindling budget. The variations evolved for easier pronunciation in popular usage. The concept of a curved space in mathematics differs from conversational usage. Apple rates the device's battery for 18 hours of mixed usage. See below for examples illustrating stack usage. It is too small to have any general lumber usage.