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The interpretation of the -θ- (/θ/) in the Avestan zaraθuštra was for a time itself subjected to heated debate because the -θ- is an irregular development: as a rule, *zarat- (a first element that ends in a dental consonant) should have Avestan zarat- or zarat̰- as a development from it. Why this is not so for zaraθuštra has not yet been determined. Notwithstanding the phonetic irregularity, that Avestan zaraθuštra with its -θ- was linguistically an actual form is shown by later attestations reflecting the same basis.[2] All present-day Iranian-language variants of his name derive from the Middle Iranian variants of Zarθošt, which, in turn, all reflect Avestan's fricative -θ-.[citation needed]