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When a lot of bottles are put together,We can not find ourselves accurately.Then we will throw this bottle of water and buy another,which bringing about seriously resources waste. This is a scrip sticking on the bottle,there are seven colors.Just tearing the color you do not like so that it is easy to distinguish the bottle.Everyone left different signs,therfore,if you notice your unfavorite color is disappear,the bottle of water is yours.