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