In Spanish non-sentence constructions, beginning elements establish a datum of reference to what is already known by carrying meaning within the confines of conventionalized order-class paradigms. Following elements, on the other hand, narrow the possibilities of syntagmatic combination to give final, new definition to the expression.
At the beginning of constructions, the potential paradigms that occur first are smaller in extension, and thus more contrastive; paradigms nearer the center are larger, and more complex. The value of relative complexity or contrast of each such paradigm is closely connected to its characterizing semantic tag.
Following elements possess syntagmatic contrast similar to the contrast perceived in initial paradigms; preceding elements, which are non-contrastive, are perceived as syntagmatically complex. Phrases and clauses, by nature complex, are placed at the end of constructions, allowing the possible modulation or neutralization of end contrast.