9 The most obvious difficulty is that, whereas the main plea in par 10 is of a bilateral agreement between two entities of the one part and two entities of the other part, the express terms pleaded in par 11 suggest that the plaintiffs do not rely on a bilateral agreement, but on a multilateral agreement; that is, an agreement having more than two sides. As a contractual promise may only be enforced by a promisee who has provided consideration, the question whether a party alleges a bilateral contract or a multilateral contract is an important one. It may turn out to be basic to the plaintiffs' entitlement to relief and I suspect that is the position in this case. I will try to explain that in this way. Where A and B jointly make a promise to C and D jointly and the latter between them provide consideration for the promise, either of them may enforce the promise. It is that kind of contract that seems to be pleaded in par 10. But a promise may be made by two parties severally to each of two parties severally, or by one party to the other three or by three parties to the other one or by one of the several parties to another of the several parties. The pleading in par 11 suggests that the arrangement upon which the plaintiff, Pac-Asia, relies and which it now seeks to enforce is a multilateral arrangement of this kind; that is, an arrangement in which several entities contract severally: see, for example, par 11(b) of the statement of claim. If the agreement is a bilateral agreement between Port Kennedy Golf Country Club Pty Ltd and Pac-Asia on the one side and Port Kennedy Resorts Pty Ltd and Fleuris on the other side, as is pleaded in par 10, there would be no place in the contract for a contractual arrangement such as is pleaded in par 11(b) whereby rights and obligations arise as between two parties on the one side of the bargain, that is, Port Kennedy Resorts Pty Ltd and Fleuris. These observations apply also to the contractual arrangements pleaded in par 11(h), par 11(i), par 11(j) and par 11(k). Those subparagraphs of par 11 plead contractual arrangements as between parties who are said in par 10 to be on the same side of the contract. The plaintiffs cannot have it both ways. If the contract (the investment agreement) is a bilateral contract as pleaded in par 10, no cause of action is disclosed in the subparagraphs of par 11 to which I have referred. No consideration passes between parties who are on the same side of a bilateral contract. This cannot be overcome by a plea such as that in par 12A, which is nothing more than a bare statement of a legal proposition, depending for its correctness on such material facts as are pleaded and proved. In this case, it is a legal proposition which is not sustained by the material facts pleaded in par 11 of the statement of claim.