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Sindhi and Punjabi separated between  A.D.750 to 1400
 
PEOPLES AND LANGUAGES IN PRE-ISLAMIC INDUS VALLEY

http://asnic.utexas.edu/asnic/subject/peoplesandlanguages.html

"John Bordie, using linguistic evidence of loss of certain words per thousand years, suggests that Sindhi and Punjabi separated between A.D.750 to 1400 and that the implosives of the Sindhi language 'came into existence prior to A.D. 1400 and subsequent to the separation of Sindhi from the mass of related languages.

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