Compounds of formula : wherein L is CH or N; M is CH or N; provided that L and M are not both CH; compositions comprising them, processes for preparing them and their use in medical therapy . A first signal to the target telephone indicates an incoming call, and a second signal to the calling telephone indicates that the target telephone is busy. The cover body can cover and uncover a handle and the airbag, and is torn at a thinned portion when the second component part of the airbag is deployed and expanded, and thus the second component part is uncovered. The present invention also relates to a method of forming a metallization layer such that a substantially deposited, planarized interlayer dielectric layer can be formed without etchback or chemical-mechanical polishing. Articles comprising and process using the hot melt adhesive are also disclosed.