CREATE TABLE table_22801 ("Year" TEXT, "League" TEXT, "Reg. Season" TEXT, "Playoffs" TEXT, "Owner ( s ) " TEXT, "Avg. Attendance" FLOAT)

in what playoffs the league was in the semifinals
SELECT "League" FROM table_22801 WHERE "Playoffs" = 'Semifinals'
SELECT "League" FROM "table_22801" WHERE "Playoffs" = 'Semifinals'