Methods, systems, and apparatus, including computer programs encoded on a computer-readable storage medium, including a method for propagating labels. By selectively employing the one or more subsets of UI functions, a UE can dynamically adapt to the motion of the UE and limit distracting interactions with the UE creating a safer or more compliant wireless environment. An input video signal of an interlaced scan format passes through an MCI block, an EDI block, and a line averaging interpolation block, respectively. The content pages are rectangular in shape and may be oriented relative to the envelope sheets in a number of different configurations. The litter provides mental stimulation and boredom reduction of a caged animal.