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(a). Number of communicative functions according to the Inventory of Potential Communicative Acts (IPCA) [15] fulfilled through non-linguistic vocalizations by a typically developing female (C), a female who was later diagnosed with the preserved speech variant (B) and a female later diagnosed with typical Rett syndrome (A) between 9 and 24 months of age; (b). Number of communicative functions according to the IPCA [15] fulfilled through (pre)linguistic vocalizations.
