Question: a code is formed by selecting four letters from the set L={A,B,C,D,E}, without replacement. For example, CDAB and DABC are two possible codes but CAEC

a code is formed by selecting four letters from the set L={A,B,C,D,E}, without replacement. For example, CDAB and DABC are two possible codes but CAEC is not a possible code. How many such codes will contain the letter D

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