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1 |
| UN/ECE level A |
| As defined in the basic code table of ISO 646 with the exceptions of lower case letters, alternative graphic character allocations and national or application-oriented graphic character allocations. |
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2 |
| UN/ECE level B |
| As defined in the basic code table of ISO 646 with the exceptions of alternative graphic character allocations and national or application-oriented graphic character allocations. |
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3 |
| UN/ECE level C |
| As defined in ISO 8859-1 : Information processing - Part 1: Latin alphabet No. 1. |
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4 |
| UN/ECE level D |
| As defined in ISO 8859-2 : Information processing - Part 2: Latin alphabet No. 2. |
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5 |
| UN/ECE level E |
| As defined in ISO 8859-5 : Information processing - Part 5: Latin/Cyrillic alphabet. |
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6 |
| UN/ECE level F |
| As defined in ISO 8859-7 : Information processing - Part 7: Latin/Greek alphabet. |
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7 |
| UN/ECE level G |
| As defined in ISO 8859-3 : Information processing - Part 3: Latin alphabet. |
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8 |
| UN/ECE level H |
| As defined in ISO 8859-4 : Information processing - Part 4: Latin alphabet. |
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9 |
| UN/ECE level I |
| As defined in ISO 8859-6 : Information processing - Part 6: Latin/Arabic alphabet. |
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10 |
| UN/ECE level J |
| As defined in ISO 8859-8 : Information processing - Part 8: Latin/Hebrew alphabet. |
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11 |
| UN/ECE level K |
| As defined in ISO 8859-9 : Information processing - Part 9: Latin alphabet. |
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12 |
| UN/ECE level X |
| Code extension technique as defined by ISO 2022 utilising the escape techniques in accordance with ISO 2375. |
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13 |
| UN/ECE level Y |
| ISO 10646-1 octet without code extension technique. |
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