An plug storage structure of a cleaning robot is presented. The drum simultaneously rotates in a first rotational direction and oscillates about an axis of rotation. Annotations are used to drive applications, serve as gestures, find related information and to further manage information. At least one projection extends from the sensor opening of the pull plate generally towards the sensor and is configured to direct magnetic flux from the magnets in a closed-loop path through the sensor. The delivery quote is solicited by the first web location for delivering a content object one or more times.