Question: Find a function E to detect an error in the representation of a decimal digit in BCD. Each decimal digit is expressed as a 4-bit

Find a function E to detect an error in the representation of a decimal digit in BCD. Each decimal digit is expressed as a 4-bit string {WXYZ}; {0000}=0, {0001}=1, , {1001}=9. In other words, write an equation with value 1 when the inputs are any one of the six unused bit combinations in the BCD code, and value 0 otherwise (for BCD digits 0-9).

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