Question: A new programming language requires variable names to start with a letter (upper or lowercase), which can be followed by letters, numbers, or underscores. For

A new programming language requires variable names to start with a letter (upper or lowercase), which can be followed by letters, numbers, or underscores. For example, a1_B_3 is a valid name. If every variable name has to be at least 3 characters but fewer than 7, how many variable names are possible?

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