<|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: all the data used in the analysis comes from freely available sources including fao (http://www.glcn.org/activities/africover_en.jsp and http://www.fao.org/ag/againfo/resources/en/glw/glw_dens.html and http://www.grid.unep.ch/data/data.php), nasa (http://srtm.usgs.gov/index.php), serengeti data (www.serengetidata.org), world harmonized soil database (http://www.isric.org/data/soil-and-terrain-database-southern-africa-ver-10-sotersaf), google earth, and the government of the united republic of tanzania (http://www.nbs.go.tz/).<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>