CREATE TABLE table_75312 ("Season" CLOB, "Season Premiere" CLOB, "Season Finale" CLOB, "Winner" CLOB, "Runner-up" CLOB, "Number of Contestants" FLOAT, "Winner's Country" CLOB, "Runner Up's Country" CLOB)

What season's premiere had puerto rico winning on May 20, 2012?
SELECT "Season Premiere" FROM table_75312 WHERE "Winner's Country" = 'puerto rico' AND "Season Finale" = 'may 20, 2012'
SELECT "Season Premiere" FROM "table_75312" WHERE "Season Finale" = 'may 20, 2012' AND "Winner's Country" = 'puerto rico'