Four positions × four relations = sixteen theoretical patterns. This is a classification by two independent dimensions.
The source provides examples for thirteen of these and leaves three without individual illustrations. The omission does not itself prove the remaining patterns impossible.
To classify a line, first determine the location of the earlier expression, then its relationship to the closing expression.
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Radd al-ʿAjz ʿalā al-Ṣadr: Repetition, Paronomasia and Derivation in Prose and Poetry
Four positions × four relations = sixteen theoretical patterns. This is a classification by two independent dimensions.
The source provides examples for thirteen of these and leaves three without individual illustrations. The omission does not itself prove the remaining patterns impossible.
To classify a line, first determine the location of the earlier expression, then its relationship to the closing expression.