Table: cupen_rounds
Columns: round
clubs_remaining
clubs_involved
winners_from_previous_round
new_entries_this_round
leagues_entering_at_this_round

Question: How many clubs remained when there were 4 winners from the previous round?
SQL: SELECT "clubs_remaining" FROM cupen_rounds WHERE "winners_from_previous_round" = 4

Question: What is the maximum number of clubs remaining when the league entering at this round was allsvenskan?
SQL: SELECT MIN("clubs_remaining") FROM cupen_rounds WHERE "leagues_entering_at_this_round" = 'Allsvenskan'

Question: How many different values of clubs involved were there when the league entering at this round was allsvenskan?
SQL: SELECT COUNT("clubs_involved") FROM cupen_rounds WHERE "leagues_entering_at_this_round" = 'Allsvenskan'