sentences:  Although it is a full member of the Socialist International along with its rival, the left-wing PRD (this makes Mexico one of the few nations with two major, competing parties that are part of the same international grouping), the PRI is not considered a social democratic party in the traditional sense.Furthermore, the adherents of the PRI are known in Mexico as "Priístas" and the party is nicknamed "El tricolor" (Tricolor) because of its use of the Mexican national colors of green, white and red as found on the Mexican flag.At first glance, the PRI's name looks like a confusing oxymoron or paradox to speakers of English, for they normally associate the term "revolution" with the destruction of "institutions".