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Use this link to calculate the critical path among all the cards specified in this group. This is extremely useful when the cards are made specifically for various connected set of tasks being done in a project.
This can only be done on those cards whose title starts with a value given in parenthesis, for example:
(a15) Foundation
In the above example; it denotes the task to be a15 as that is the value given inside the parenthesis. If the above format is not used, then it would not be used for the critical path analysis.