A project is represented by the activity durations (estimated at 90% likelihood of completion) and precedence requirements shown in the table. What is the length of the project buffer if this project is managed using critical chain methodology? 
Definitions:
Proposition
A proclamation or assertion signaling an assessment or belief.
Obverse
The statement formed by negating both the subject and predicate of a given categorical proposition and changing the quality of the original proposition (from affirmative to negative or vice versa).
Proposition
A statement or assertion that expresses a judgment or opinion, which can be evaluated as true or false.
Obverse
The opposite or counterpart of a given statement, often involving negation.
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