Question: /What is Tie No, when Date is 18 February 1956, and when Away Team is Tottenham Hotspur?
SQL: SELECT "Tie no" FROM "2-17054550-6" WHERE "Date" = '18 February 1956' AND "Away team" = 'Tottenham Hotspur';

Question: What is Tie No, when Date is 18 February 1956, and when Home Team is Charlton Athletic?
SQL: SELECT "Tie no" FROM "2-17054550-6" WHERE "Date" = '18 February 1956' AND "Home team" = 'Charlton Athletic';

Question: What is Score, when Tie No is Replay, and when Home Team is Sunderland?
SQL: SELECT "Score" FROM "2-17054550-6" WHERE "Tie no" = 'Replay' AND "Home team" = 'Sunderland';

Question: What is Home Team, when Date is 18 February 1956, and when Away Team is Blackburn Rovers?
SQL: SELECT "Home team" FROM "2-17054550-6" WHERE "Date" = '18 February 1956' AND "Away team" = 'Blackburn Rovers';

Question: What is Home Team, when Date is 18 February 1956, and when Tie No is 3?
SQL: SELECT "Home team" FROM "2-17054550-6" WHERE "Date" = '18 February 1956' AND "Tie no" = '3';

Question: What is Home Team, when Tie No is 4?
SQL: SELECT "Home team" FROM "2-17054550-6" WHERE "Tie no" = '4';