CREATE TABLE table_46470 ("Show" CLOB, "Last Aired" FLOAT, "Previous Network" CLOB, "Retitled as/Same" CLOB, "New/Returning/Same Network" CLOB, "Returning" CLOB)

Which Last Aired has a Retitled as/Same of classic concentration?
SELECT "Last Aired" FROM table_46470 WHERE "Retitled as/Same" = 'classic concentration'
SELECT "Last Aired" FROM "table_46470" WHERE "Retitled as/Same" = 'classic concentration'