#1: HORIZONTAL LINES IN SQUARES

Used in A, E, F, H, I, L, T, Z, e, f, t, z, 2, 4, 5, 7

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#2:  COUNTERCLOCKWISE SPIRALS IN CIRCLES

Used in C, G, O, Q, a, c, d, e, g, o, q, s, 6, 8, 9, 0

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#3:  RIGHT-SLANTS IN TRIANGLES

Used in A, K, Q, R, V, W, X, Y, k, v, w, x, y

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#4:  VERTICAL LINES IN RECTANGLES

Used in B, D, E, F, H, I, J, K, L, N, P, R, T, Y, b, d, h, i, j, k, l, m, n, p, q, r, t, 1, 4, 

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#5:  CLOCKWISE SPIRALS IN OVALS

Used in B, D, P, R, S, b, p, 2, 3, 8

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#6:  LEFT-SLANTS IN DIAMONDS

Used in A, K, M, Y, k, x, y, z, 2, 7