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1 |
| Interchange is a test |
| Indicates that the interchange is a test. |
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2 |
| Syntax only test |
| Test only syntax of structure. |
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3 |
| Echo request |
| To be returned without change, except for this data element to have the value 4. |
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4 |
| Echo response |
| Returned without change except for this data element changing from 3 to 4. |
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