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<response><unit><id>249b030c-6242-4675-aa4a-7acb7bc9d054</id><parent_id>c78ad08f-446e-4569-b3b4-3f9c18e5256f</parent_id><number>4.6.1</number><names>[{"lang":"es","name":"Ecuación diferencial ordinaria (EDO)"},{"lang":"en","name":"Ordinary differential equation (ODE)"},{"lang":"ca","name":"Equació diferencial ordinària (EDO)"}]</names><difficulty>9</difficulty><created>7/18/16, 11:43 AM</created><modified>7/18/16, 11:43 AM</modified></unit></response>
