CREATE TABLE table_12437 ("Tie no" TEXT, "Home team" TEXT, "Score" TEXT, "Away team" TEXT, "Date" TEXT)

What is Home Team, when Date is '6 December 1986', and when Tie No is '4'?
SELECT "Home team" FROM table_12437 WHERE "Date" = '6 december 1986' AND "Tie no" = '4'
SELECT "Home team" FROM "table_12437" WHERE "Date" = '6 december 1986' AND "Tie no" = '4'