CREATE TABLE table_204_633 (id DECIMAL, "launch date" TEXT, "operator" TEXT, "name" TEXT, "sample origin" TEXT, "samples returned" TEXT, "recovery date" TEXT, "mission result" TEXT)

what was the name of the mission previous to cosmos 300 ?
SELECT "name" FROM table_204_633 WHERE id = (SELECT id FROM table_204_633 WHERE "name" = 'cosmos 300') - 1
SELECT "name" FROM "table_204_633" WHERE "id" = (SELECT "id" FROM "table_204_633" WHERE "name" = 'cosmos 300') - 1