Analysis of information sources in references of the Wikipedia article "General American English" in English language version.
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Another pronunciation even more widely heard among older teens and adults in California and throughout the West is 'een' for -ing, as in 'I'm think-een of go-een camp-een.'
Regional Accents ... A distinguishing characteristic of the Upper Midwestern accent is the tendency to turn the 'ing' sound into 'een,' with a cheerful 'Good morneen!'
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