tolkienlanguages1-9  Exercise 3: Strength and Difficulty
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A sample answer.

Strength: the revising shows a language with real depth. Tolkien refined
the family history, moving from Gnomish and Noldorin to Sindarin, and the
languages gained a story of their own. Example: the name swap, where the
old Noldorin became Sindarin.

Difficulty: no single stage is final, so a learner cannot assume that a word
or ending from one source is valid in another. Example: a word from the
Etymologies may belong to a stage that never became Sindarin, so it has to be
checked before use.