Arrangements and methods for performing structural clustering between different time series. The contents filtering method monitors communications of contents on the network and determining whether the contents are regulated contents satisfying predefined regulatory requirements or not, and then counts the number of times that the regulated contents are communicated. A second frame rotatably connects to the first frame. Data held in the database is retrieved by searching for a child node using the child node search unit set for each node by the setting unit. The emulsions of the present invention are stable for extended periods of time when stored at room temperature and do not require the addition of a bactericide. The aerosol, in particular vitamin A, is introduced from a cartridge 17 into the interior of the container 2 via a nebulizer 18.