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17. Final combinations-pt, ft, bd, md; vd, thd, nth, mp, un,

nt, nd, tn, dn
18. Substitution of n for m and m for n

.

20. Initial combinations—tw, sw
21. Substitution of th for s, and s for th
22. Initial and final combinations-st; sp, sm; sn
23. Final combinations-ps, fs, ths; ts, sts, ns

üi

S

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