| item | description | category | filter | more on... |
| OPEN | Objects, Process, Environment, and Notation | IT/Software |
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| OPEN | Olympic and Paralympic Employment Network | Business/Firms |
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| OPEN | Open-Car Pleasure and Entertainment Network | Business/Firms |
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| OPEN | Oregon Public Education Network | TV Stations |
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| OPEN | Orphan Pets Enjoy Nature | Non-Profit Organizations |
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