This paper describes two procedures for the establishment of syntagmatic concordances through pre-coding and automatical analysis for the nominal syntagm. The first is pre-coding of the text, in this instance the poetry of P. Valéry, in accordance with taxonomic grids enumerating the typical patterns followed by the syntagm to be analyzed. From a strictly mathematical point of view, there are too many possible combinations (several thousand), and the number of typical patterns is therefore reduced as much as possible. In these taxonomic grids the analytical structures are poor. The second is the automatic analysis of simultaneous occurrences to left and right of a pivot term set by pre-coding. All the categories known as the “parts of speech” are precoded. In this process of recognition, the categories comprised by the units of the chain and their syntactical functions are also pre-coded.