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=begin
Imagine you have a call centre with three levels of employees: respondent, manager, and director.
An incoming telephone call must be first allocated to a respondent who is free.
If the respondent can't handle the call, he or she must escalate the call to a manager.
If the manager is not free or not able to handle it, then the call should be escalated to a director.
Design the classes and data structures for this problem. Implement a method "dispatch_call()" which
assigns a call to the first available employee.
=end
describe "call centre" do
end
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