question: How many teams have a combination classification of Alejandro Valverde and a Points classification of Alessandro Petacchi?
answer: SELECT COUNT(team_classification) FROM table_15059783_1 WHERE combination_classification = "Alejandro Valverde" AND points_classification = "Alessandro Petacchi"
context: CREATE TABLE table_15059783_1 (team_classification VARCHAR, combination_classification VARCHAR, points_classification VARCHAR)