![[SOLVED] CS class PhoneBook](https://assignmentchef.com/wp-content/uploads/2022/08/downloadzip.jpg)
class PhoneBook
def initialize
end
def add(name, number, is_listed)
raise Exception, Not implemented
end
def lookup(name)
raise Exception, Not implemented
end
def lookupByNum(number)
raise Exception, Not implemented
end
def namesByAc(areacode)
raise Exception, Not implemented
end
end
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