Based on primary data from Tundra Nenets, this paper explores phonological patterns which seem to require restrictions on the input, and thus present a particular challenge to Optimality Theory. In these patterns, a contrastive segment appears only in the environments where it is also derived by active alternations in the language. I illustrate this with the behaviour of Tundra Nenets /k/, and argue that these patterns can be analysed as distributional generalisations that hold only at early derivational levels. A Stratal OT analysis is proposed. Tundra Nenets also presents a pattern which appears to involve unnatural classes, but is reanalysed with only natural class alternations in my account.

中文翻译：

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Tundra Nenets 中的不透明分布概括

基于 Tundra Nenets 的原始数据，本文探讨了似乎需要限制输入的语音模式，因此对最优理论提出了特殊的挑战。在这些模式中，对比片段仅出现在它也由语言中的主动交替派生的环境中。我用 Tundra Nenets /k/ 的行为来说明这一点，并认为这些模式可以被分析为仅在早期衍生水平上存在的分布概括。提出了地层 OT 分析。Tundra Nenets 还提出了一种似乎涉及非自然类的模式，但在我的描述中仅使用自然类交替进行了重新分析。