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Merge pull request #9 from sheivin/master

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This is the very basic parts of the Tile class
Car class skeleton
This class makes one node of type char to be used by the program. Each node refers to the previous and next node.
This class allows the program to add characters to the list.
This is the main program, which asks the user for a string and will store, then print it forwards and backwards.
This does the same thing accomplished by the other three programs by using the built in linkedlist functionality.
This program contains the ability to find the parent of a set, and to union two sets of any size.
Merge pull request #13 from yfei5/master

Tile class and subclasses with inheritance structure