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| in an hour (13-36 months age) | in a year (1 year age) | up to 3 years age | ||
|---|---|---|---|---|
| high-SES | 487 | 11.000.000 | 45.000.000 | |
| mid-SES | 301 | |||
| low-SES | 178 | 3.000.000 | 13.000.000 |
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30 million words: the number of words heard by children.