A composition for dust suppression including an acrylic polymer, a polyvinyl acetate polymer, glycerin, and water is herein disclosed. The objective of channel neutralisation is to design a system that accommodates the highest possible rate of data transmission, subject to a specified reliability, which is usually measured in terms of the error rate or average probability of symbol error. Numerous other aspects are disclosed. At least one stent retaining sleeve, having a first end and a second end, wherein the first end overlays an end of the stent when the stent is in the unexpanded state. The method of playing contents may include displaying a reference image of a content, when sensing a user’s input, determining a playback scheme matched with the user’s input, and playing the content on the basis of the playback scheme matched with the user’s input.