Description 4: Level Rule Options and Defaults (continued)
The valid level rule options for each index format are provided below:
| Level 0 may | Level 1 may | Level 2 may | Level 3 may |
| be followed by | be followed by | be followed by | be followed by |
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Single Level | Level 0 | Level 0 | n/a | n/a |
| Level 1 | Level 1 |
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Two Level | Level 0 | Level 0 | Level 0 | n/a |
| Level 1 | Level 1 | Level 1 |
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| Level 2 | Level 2 | Level 2 |
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Two Level | Level 0 | Level 0 | Level 0 | n/a |
Offset | Level 1 | Level 1 | Level 1 |
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| Level 2 | Level 2 | Level 2 |
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Three Level | Level 0 | Level 0 | Level 0 | Level 0 |
| Level 1 | Level 1 | Level 1 | Level 1 |
| Level 2 | Level 2 | Level 2 | Level 2 |
| Level 3 | Level 3 | Level 3 | Level 3 |
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Three Level | Level 0 | Level 0 | Level 0 | Level 0 |
Offset | Level 1 | Level 1 | Level 1 | Level 1 |
| Level 2 | Level 2 | Level 2 | Level 2 |
| Level 3 | Level 3 | Level 3 | Level 3 |
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