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<response><unit><id>389bfc01-d17a-4c0d-8a1d-0c473c0f35e4</id><parent_id>836b0b88-39dc-4359-884f-37f4f4a0ecf1</parent_id><number>7.1.3</number><names>[{"lang":"es","name":"Unión e intersección de conjuntos"},{"lang":"en","name":"Union and intersection of sets"},{"lang":"ca","name":"Unió i intersecció de conjunts"}]</names><difficulty>4</difficulty><created>18/7/16 11:43</created><modified>18/7/16 11:43</modified></unit></response>
