An object of the present invention is to remove foreign matter such as liquid droplets from air with high efficiency using a filter. Under a first embodiment of the invention, a second surface of the glass panel is first coated with a layer of TiN. The inventive sole is characterised in that the aforementioned shock-absorbing device is an elastically-deformable element or insert which is inserted into the sole in the form of a moulded body comprising mutually-spaced tubular pieces having one closed end and one open end which is connected to a common base. The raised localized buffer pad structure increases a height of a portion of a pad structure of the solder bump connection with respect to a compressive side of the last metal layer. The second gap between the hub and the sleeve end surface is used as a flow channel and is connected to the communication path. The scores provided by the various scoring engines are adapted to provide a visual andor numerical feedback that provides information pertaining to correctness or incorrectness in one or more speech-features such as intonation, articulation, voicing, phoneme error and relative word duration.