In literary structuralism, especially in France, the analysis of deep grammatical structures went hand in hand with the analysis of rhetorical tropes (figures of discourse).
What this means is that the two axes of language, the syntagmatic (at the level of the generated sentence) and the paradigmatic (the axis of substitutions) can be read as operating together in a discourse. We can thus explain what Paul de Man means by “assimilations of rhetorical transformations or combinations to syntactical, grammatical patterns” with reference to the coexistence in structuralist theory of patterns of both metonymy (which is syntagmatic) and metaphor (which is paradigmatic).
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See that post with different algorithms in metabole
See the journal French Metablog with today different posts