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2 x 4.5 volt units, and 1 x 9 volt DC power block

2 x 4.5 volt units, and 1 x 9 volt DC power block
As the title says, I have two 4.5 volt LED light strips (each one originally ran off 3x1.5 AA batteries). Can I use one 9 volt AC-to-DC power supply (wall wart type) to power these?

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