CREATE TABLE table_77969 ("Race" TEXT, "Circuit" TEXT, "Date" TEXT, "Pole position" TEXT, "Fastest lap" TEXT, "Winning driver" TEXT, "Constructor" TEXT, "Tyre" TEXT, "Report" TEXT)

What is the tyre for the circuit of Prince George, which had Jim Clark as the fastest lap?
SELECT "Tyre" FROM table_77969 WHERE "Fastest lap" = 'jim clark' AND "Circuit" = 'prince george'
SELECT "Tyre" FROM "table_77969" WHERE "Circuit" = 'prince george' AND "Fastest lap" = 'jim clark'