user: Question: Which leagues entered in rounds where there were 16 winners from the previous round?
Columns: ['Round', 'Clubs remaining', 'Clubs involved', 'Winners from previous round', 'New entries this round', 'Leagues entering at this round']
Types: ['text', 'real', 'real', 'text', 'text', 'text']
Sample row: ['Extra Preliminary Round', 762.0, 406.0, 'none', '406', 'Levels 9 and 10 in football league pyramid']
SQL:

assistant: SELECT "Leagues entering at this round" FROM "Table" WHERE "Winners from previous round" = '16';