user: Question: What was the earliest year where USL PDL played in 3rd, Southeast season?
Columns: ['Year', 'Division', 'League', 'Regular Season', 'Playoffs', 'Open Cup']
Types: ['real', 'real', 'text', 'text', 'text', 'text']
Sample row: [1998.0, 4.0, 'USISL PDSL', '3rd, Southeast', 'Division Semifinals', 'Did not qualify']
SQL:

assistant: SELECT MIN("Year") FROM "Table" WHERE "Regular Season" = '3rd, Southeast' AND "League" = 'USL PDL';