Ai! Lá polin saca i quettar!
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The neologism [ᴺQ.] tyestima “testable” appeared in by Helge Fauskanger’s NQNT (NQNT), but it is almost certainly a typo on his part, since he used the verb [ᴱQ.] tyasta- for “(put to the) test” elsewhere in his work. I would render this neologism as tyastaima, in keeping with Tolkien’s later usage of the suffix -ima with weak verbs.