[...] different gesture languages developped for the use of deaf-mutes, of Trappist monks [...] or of communicating parties that are within seeing distance of each other but are out of earshot. - Sapir (1921), a pag.21 Some [...] systems are one-to-one equivalences of the normal system of speech; others like military gesture-symbolism or the gesture language [...] are imperfect transfers limiting themselves to the rendering of such grosser speech elements [...] - Sapir (1921), a pag.21
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