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A simplified sign language, based on British Sign Language but internationally recognized, specifically designed for people with learning difficulties of all kinds and their parents and carers, developed in 1972–3 at Botley's Park Hospital in Surrey, England, by the English speech therapist Margaret Walker (born 1938), and revised in 1976, the revised version containing approximately 350 signs and associated words. [Formed from the initial letters of the first names of its inventor, Margaret Walker, and the two psychiatric hospital visitors who assisted in its development, Kathy Johnston and Tony Cornforth]

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