There isn't one!
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A,h,i,m,o,t,u,v,w,x,y
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.
W t y u i o a h x v n m
The line of symmetry of y = 0 is x = 0.
Y does down the middle but y does not