CREATE TABLE table_16351 ("Year" TEXT, "Division" TEXT, "League" TEXT, "Reg. Season" TEXT, "Playoffs" TEXT, "Avg. Attendance" FLOAT)

What is the division for the division semifinals playoffs?
SELECT "Division" FROM table_16351 WHERE "Playoffs" = 'Division Semifinals'
SELECT "Division" FROM "table_16351" WHERE "Playoffs" = 'Division Semifinals'