Are the different kinds of loops interchangeable? in other words, can you use one in place of the other?
prg/420

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Why do we mark tlc plates with pencil and not with pen

Acontact list is a place where you can store a specific contact with other associated information such as a phone number, email address, birthday, etc. write a program that first takes in word pairs that consist of a name and a phone number (both strings). that list is followed by a name, and your program should output that name's phone number.