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As per the given series of figures, which can be classified as:-
In the first category, the figures having one full circle can be included. Such figures are (1), (4) and (7).
In the second category, the figures having one pointed end can be included. Such figures are (2), (5) and (8). In the third category, the figures consisting of both straight lines and curved lines can be included. Such figures are (3), (6) and (9).