What requirement defines the grammatical feature known as 'evidentiality', heavily present in the Amazonian language Tuyuca?

Verb endings must state how the speaker learned the information

Past tense forms are forbidden in formal conversation

Words change pronunciation based on whether the subject is alive

Noun genders shift depending on the listener's age

While mutually intelligible, what is a primary written difference between standard Serbian and standard Croatian?

Serbian uses Arabic script, while Croatian uses Cyrillic

Serbian uses Greek letters, while Croatian uses Latin

Serbian uses a pictographic script, while Croatian uses Cyrillic

Serbian uses both Cyrillic and Latin scripts, while Croatian uses Latin exclusively

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