ABCD

ABCD is a list of the first four letters in the English alphabet. It may also refer to: In medicine:ABC (medical), also known as ABCD, a mnemonic for steps in resuscitationABCD rating, a staging system for prostate cancerABCD syndrome, a genetic disorderABCD guideline, a heuristic for detecting melanomas
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Above and Beyond the Call of Duty 
American Born Confused Desi (East Indian)  For more possible definitions for ABCD, click here
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ABCD