| item | description | category | filter | more on... |
| OPX | Chart (MS Organization) | IT/File Extensions |
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| OPX | Chart (MS Organization) | IT/File Extensions |
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| OPX | Inactive options (Exact) | IT/File Extensions |
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| OPX | Inactive options (Exact) | IT/File Extensions |
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| OPX | Off Premise Extension | Business/General |
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| OPX | Off Premise Extension | IT/Telecom |
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| OPX | Ohio Power Company | Regional/Railroads |
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| OPX | Open Philanthropy Exchange | Non-Profit Organizations |
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