<|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: the facebook ego-network dataset is available from the stanford network analysis project (snap), (http://snap.stanford.edu/data). the high-school friendship network dataset is part of the addhealth "network structure files", and can be requested directly from the managers of the data at the carolina population center, unc. (http://www.cpc.unc.edu/projects/addhealth). to contact, please email: addhealth@unc.edu.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>