121=dogs at which Matt bought
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' d ' is.
The next term is ' d ' .
The next term is ' D '.
There are many letters with lines of symmetry. A, B, D, E, H, I, l, M, m, O, o, T, t, U, u, V, v, W, w, X, x, Y. A, B, D, E, H, I, l, M, m, O, o, T, t, U, u, V, v, W, w, X, x, Y.
U1 = a = 12 U2 = a + 1*d = 12 - 2 = 10 U3 = a + 2*d = 12 - 4 = 8 U4 = a + 3*d = 12 - 6 = 6 U5 = a + 4*d = 12 - 8 = 4