Occasionally, a particular logic expression will be of no consequence in the operation of a circuit, such as a BCD-to-decimal converter. These result in ________terms in the K-map and can be treated as either ________ or ________, in order to ________ the resulting term.

• don't care, 1s, 0s, simplify
• spurious, ANDs, ORs, eliminate
• duplicate, 1s, 0s, verify
• spurious, 1s, 0s, simplify