A project consists of four consecutive tasks that have average duration and worst-case duration estimates (in days) as shown in the table. Use Goldratt's model to determine the aggregated buffer for this project. 
Definitions:
Binding Contract
An agreement between two or more parties that is legally enforceable in a court of law.
Accepts Delivery
Refers to the act of receiving goods from a seller or transporter, acknowledging that the delivery meets the terms of the agreement.
Unilateral
Describes actions or agreements made by one party without the necessity for acceptance or agreement from another.
Bilateral
Pertains to a contract or agreement involving two parties who each have obligations towards each other.
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