Systems and methods are provided for performing multilevel coset coding and probabilistic error correction. The compounds have the formula: . In one embodiment, the display time difference between a current video picture and a nearby video picture is determined. The water guiding member has a groove and a plurality of increasingly conical orifices, the resilient element is accommodated in the groove and has a stopping plug pushed by the resilient element. The invention is characterized in that said method comprises a step in selecting numbers of different types of points on the boundary of the object then obtaining genus. Consistency in style and order of control elements in the user interface with control elements of a standard application user interface, launching of the dialog without a page refresh, and maintenance of task continuity provide users a seamless experience in managing their documents through the web application without loss of context.