CREATE TABLE table_21434 ("Episode Number" FLOAT, "Air Date" TEXT, "Event 1" TEXT, "Event 2" TEXT, "Event 3" TEXT, "Event 4" TEXT)

On which episode number is event 4 The Wall and event 1 the Pendulum?
SELECT COUNT("Episode Number") FROM table_21434 WHERE "Event 4" = 'The Wall' AND "Event 1" = 'Pendulum'
SELECT COUNT("Episode Number") FROM "table_21434" WHERE "Event 1" = 'Pendulum' AND "Event 4" = 'The Wall'