They are alike because they are all different columns of digits and they are different because they have different columns.
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When you add, you put two numbers together. When you subtract, you take a number away from another. They are alike because they both are ways to solve a math problem, easy or hard, and different because adding and subtracting are pretty much the opposite of each other, if you really think about it.
The "name" of the period.
A square triangle and hexagon are alike becaue they are shapes. they are also alike because the have straight lines and no curved. each of the shapes have a base and at least 2 corners. hope these are good for what you needed and sorry if not.
It can have any shape that you like. The main point is that it is repeated for each period.
Different