 Complete the following phrase:  Nicknamed el Flaco the Skinny one, he made his debut for the national team in an April 1991 friendly match against Mexico, collecting a total of 31 caps and scoring 9 goals. Arnáez appeared in seven of Costa Ricas qualifying matches for the 1994 FIFA World Cup, as well as two qualifiers for the 1998 FIFA World Cup. He also represented Costa Rica at the 