<|begin_of_text|><|start_header_id|>system<|end_header_id|>

You are an expert at identifying data availability statements in scientific text. A data availability statement describes where research data can be found or how it can be accessed.<|eot_id|><|start_header_id|>user<|end_header_id|>

Determine if the following text contains a data availability statement. Answer with 'yes' or 'no'.

Text: data were obtained from the united nations commodity trade statistics database (http://comtrade.un.org/db/), the penn world tables version 6.2 (http://pwt.econ.upenn.edu/), and the unu-wider world income inequality database (https://www.wider.unu.edu/data).<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>