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2Significado: bindingnecessary essential obligatory requisite required
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3Significado: inevitableinvoluntary necessary undeniable assuredcertain imminent unavoidable
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4Significado: necessityrequirement necessary need obligationdemand requisite prerequisite
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5Significado: requirednecessary essential binding requisite obligatory
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6Significado: rudimentnecessity basic fundamentalelement necessary essential
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7Significado: requirementqualification demand vital part postulateessential imperative necessary necessity
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8Significado: mandatoryimperative obligatory compulsorynecessary urgent imperious
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9Significado: vitalcrucial essential critical importantintegral necessary strategic
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10Significado: performing a functionpractical utilitarian useful necessary functional
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11Significado: obligatorymandatory requisite compelled forcedrequired inescapable necessary compulsory