An observed sequence of items classified under the B2 category is as follows: B2,2, B2,3, B2,1, and B2,2.

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This classification system categorizes 'BL', 'B1', and 'B2' into two distinct levels: a high level, represented by (↑), and a low level, represented by (↓).

Classification of BL, B1, and B2 Levels

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Example Sequence of B2 Category Items

The categories 'BL', 'B1', and 'B2' are each subdivided into a high level, indicated by (↑), and a low level, indicated by (↓). This classification results in six distinct subcategories: BL (↑), BL (↓), B1 (↑), B1 (↓), B2 (↑), and B2 (↓).

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