CREATE TABLE table_30624 ("Position" TEXT, "Player" TEXT, "Period" TEXT, "Teams" TEXT, "Consecutive starts" FLOAT, "Playoffs" FLOAT, "Total" FLOAT)

What period(s) featured a left inside linebacker?
SELECT "Period" FROM table_30624 WHERE "Position" = 'Left inside linebacker'
SELECT "Period" FROM "table_30624" WHERE "Position" = 'Left inside linebacker'