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Write a program or function which receives as input a string representing a Welsh word (UTF-8 unless otherwise specified by you).
The following are all single letters in Welsh:
a, b, c, ch, d, dd, e, f, ff, g, ng, h, i, j, l, ll, m, n, o, p, ph, r, rh, s, t, th, u, w, y
To quote Wikipedia,...