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four
H,i,o,x
The letters with vertical line symmetry are: W, T, Y, U, I, O, A, H, X, V, M. The letters with horizontal line symmetry are: E, I, O, D, H, X, C, B.
Capital h, i, o, t, x.
The letters: I O H X o x all exhibit bilateral symmetry and rotational symmetry, with O and X exhibiting it in both upper and lower case.