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The lumbar spine is commonly approached posteriorly but can also be approached from anterior and laterally. The trans-psoas approach is designed to approach the lumbar disc space and allow good removal of disc material whilst avoiding the posterior neural structures.

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A system can be of a single purpose or multiple purpose. Here an ATM card user is supposed to get his money from the teller machine within 4 or 5 seconds from the moment he press the confirmation button. The card user will not wait 5 minutes at the ATM after he pressed the confirm button.

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