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y)a EIN (U.S. Employer Identification Number).
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employees.
>>> validate('91-1144442')
'911144442'
>>> get_campus('04-2103594') == 'Brookhaven'
True
>>> validate('911-14-4442') # dash in the wrong place
Traceback (most recent call last):
...
InvalidFormat: ...
>>> validate('07-1144442') # wrong prefix
Traceback (most recent call last):
...
InvalidComponent: ...
>>> format('042103594')
'04-2103594'
>>> format('123') # unknown formatting is left alone
'123'
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