http://creativecommons.org/licenses/by/2.1/es/legalcode.ca http://creativecommons.org/licenses/by/2.1/es/legalcode.es es https://creativecommons.org/licenses/by/2.1/es/legalcode.ca https://creativecommons.org/licenses/by/2.1/es/legalcode.es 2.1 by http://creativecommons.org/licenses/by/4.0/ http://creativecommons.org/licenses/by/2.0/ Reconeixement 2.1 Reconocimiento 2.1

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