[ʃ] ). Polish and Russian have laminal denti-alveolars, palatalized denti-alveolars, flat postalveolars, and alveolo-palatals ( [s̪ z̪] [s̪ʲ z̪ʲ] [s̠ z̠] [ɕ ʑ] ), whereas Mandarin has apical alveolars, flat postalveolars, and alveolo-palatals ( [s̺ z̺] [s̠ z̠] [ɕ ʑ] ). Few languages distinguish more than three series of sibilants without