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The remaining oral sounds are gener-ally grouped together as "consonants." In them the stream of breath is interfered with in some way, so that a lesser resonance re-sults, and a sharper, more incisive quality of tone. There are four main types of articula-tion generally recognized within the conso-nantal group of sounds. The breath may be completely stopped for a moment at some definite point in the oral cavity. Sounds so produced, like t or d or p, are known as "stops" or "explosives." * Or the breath may be continuously obstructed through a nar-row passage, not entirely checked. Examples of such "spirants" or "fricatives," as they are called, are s and z and y.