The efficacy of the vexatious clauses, strictly indicated in art. 1341 of the Italian Civil Code civ., Between which are the the clauses skips, is subordinates born at specific approval per member in the only cases in which le called clauses are inserted in contracts with conditions general prepared d A one only of the contractors (art. 1341, co. 1, of the Italian Civil Code) or conclusions through the subscription of modules or formulari (art. 1342, co. 1, cod. civ.) , and not also in different hypotheses, and in detail, when the shop is state concluded a followed and for effect of negotiations held between the parts.