Selectively determining a particular graphical user interface widget to receive focus based upon user-entered directional information. Pair-wise correlations are learned between pairs of the annotated attributes from the training dataset of images. The sleeve piston can be coupled to the bolt carrier by two or more operating rods, thereby reducing the tipping force experienced by the bolt carrier during firearm operation. The moldable inner support is only affixed to the band at its ends so that it may move freely with respect to the band and also provides focused pressure to reduce knee pain and helps stabilize the patella to improve alignment and tracking. The folded flex circuit interconnect further includes an electrical interface at a second end that is connected to the conductor layer. In an embodiment, there are provided a hook system that is polyaxially or otherwise movably coupled to a body that receives a spinal rod.