Table: giro_1991
Columns: stage
winner
general_classification
points_classification
trofeo_fast_team

Question: What was the stage of team Once?
SQL: SELECT "stage" FROM giro_1991 WHERE "trofeo_fast_team" = 'once'

Question: Which team had a final stage when Claudio Chiappucci had the points?
SQL: SELECT "trofeo_fast_team" FROM giro_1991 WHERE "points_classification" = 'claudio chiappucci' AND "stage" = 'final'

Question: What stage did team Carrera Jeans-Tassoni have when Mario Cipollini won and Claudio Chiappucci had the points?
SQL: SELECT "stage" FROM giro_1991 WHERE "trofeo_fast_team" = 'carrera jeans-tassoni' AND "winner" = 'mario cipollini' AND "points_classification" = 'claudio chiappucci'