<|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 data used in this paper come from the latest official sources in the executive branch of the brazilian federal government, covering political boundaries, settlement polygons, vegetation and infrastructure: http://acervofundiario.incra.gov.br/i3geo, www.incra.gov.br www.transportes.gov.br, www.ibge.gov.br, www.inpe.br/queimadas, http://mapas.mma.gov.br/i3geo, http://siscom.ibama.gov.br/, and http://mapas.mma.gov.br/i3geo.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>