CREATE TABLE table_10618 ("Entrant" TEXT, "Constructor" TEXT, "Chassis" TEXT, "Engine" TEXT, "Tyre" TEXT, "Driver" TEXT, "Rounds" TEXT)

In what rounds did the P15 Chassis and tyre D participate?
SELECT "Rounds" FROM table_10618 WHERE "Tyre" = 'd' AND "Chassis" = 'p15'
SELECT "Rounds" FROM "table_10618" WHERE "Chassis" = 'p15' AND "Tyre" = 'd'