Table 1.
The legal and ill-legal sequences
| Sequence | Legal | Ill-legal |
|---|---|---|
| B, O, … | * | |
| B, B, O, … | * | |
| B, I, O, … | * | |
| B, I, B, I, O,… | * | |
| O, I, O, … | * | |
| O, I, B, O, … | * |
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