Book 1 concentrates on sounds: s, a, t, i, p, n
Book 2 concentrates on sounds: c k, e, h, r, m, d
Book 3 concentrates on sounds: g, o, u, l, f, b
Book 4 concentrates on sounds: ai, j, oa, ie, ee, or
Book 5 concentrates on sounds: z, w, ng, v, oo, oo
Book 6 concentrates on sounds: y, x, ch, sh, th, th
Book 7 concentrates on sounds: qu, ou, oi, ue, er, ar
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