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please do not waste this answer because now only ONE other person can answer. If you do not know the answer please do not answer the question. Thankyou!
Answer:
l, t, d
Explanation:
This is the sequence of Tonic sol-fa (or tonic sol-fah)
(e.g. do, re, mi, fa, sol, la, ti, do) or their abbreviations (d, r, m, f, s, l, t, d)
It is a pedagogical technique for teaching sight-singing
