Хаснователь:Surjection

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Surjection

$f:X\rightarrow Y$	$f(x)=y$
$\forall y\in Y:\exists x\in X$

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fi-N	Tämän käyttäjän äidinkieli on suomi.

en-5	This user has professional knowledge of English.

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/ðɪs ˈjuːzəɹ həz ədˈvænst ˈnɒlɪd͡ʒ ʌv ˌɪntɚˈnæʃ(ə)n(ə)l fəˈnɛtɪk ˈælfəˌbɛt/.

lua-N	Cet utilisateur parle en ciluba comme langue maternelle.

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