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thinking of body-anchored signs, such as HEAD or WHY, and signs that are not body anchored, such as HAVE or STOP and recognising that non-body anchored signs can be located in space around the signer
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http://rdf.australiancurriculum.edu.au/elements/2018/05/ddd63667-3173-49fa-bbf0-f8fe3ef36faf.rdf