• I think that you are talking about this text: 'Do small white balls squeak? Pitch–object correspondences in young children' Source: It appears from studying the text that it is about young children between 2 1/2 and 3 year old. The text 'from 33:26 to 35:19 months' is short for 'from 33 months and 26 days to 35 months and 19 days'.

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