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BY USING FORMULA (M+R+1)<=2r 011110110011001110101 ----

The formula

d + p + 1 <= 2^p

(where d is the number of data bits and p is the number of check bits)

indicates that we need at least 5 check bits in order to correct single-bit errors in blocks of 16 data bits -- a (21,16) code. SECDED requires 6 check bits for blocks of 16 data bits.

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