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Requirements to geometric objects
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| · | Point form: both points must be different.
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| · | Coordinates form: The direction vector  and  should not have the length 0.
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| · | Point form: The drei points must be different.
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| · | Coordinates form: The direction vectors should not have the length 0 and they need different directions ( ).
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| · | Radius should not be 0.
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