| item | description | category | filter | more on... |
| OEI | Obesity Education Initiative | Medical/Physiology |
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| OEI | Ocean Energy, Inc. | Business/General |
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| OEI | One Engine Inoperative | Other/Transportation |
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| OEI | Open Extract Image | IT/Software |
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| OEI | Original Equipment Industries | Business/Firms |
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| OEI | Outside Equity Interest | Business/Accounting |
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