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What does D1 stand for?

First Dorsal Nerve - Second dorsal nerve is D2, etc., through D12 - Medicine (DAVI)

First Dorsal Vertebra - Second dorsal vertebra is D2 , etc. - Medicine

Day One - First day seen for treatment - Medicine (MELL)

Double First Class

First Coast Guard District - Boston, MA - USCG (TAG)

Slight Damage - Emergency Management (EMA)

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