What are the elements of a cause of action supported by mere conclusory statements?

elements of a cause of action, supported by mere conclusory statements do not suffice." Ashcroft v. Iqbal, 556 U.S. 662, 678 (2009). Furthermore, "Rule 8(a)(2) . . . requires a showing, rather than a blanket assertion, of entitlement to relief." Twombly, 550 U.S. at 555 n.3 (internal citations and quotations omitted). A pleading must contain "enough facts to state a claim to relief that is plausible on its face." Id. at 570. If the "plaintiffs . . . have not nudged their claims across the line from conceivable to plausible, their complaint must be dismissed." Id.