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Xxxxxxxxxxx xxxxxx xx xxxxxxx (xxxxx) xxxxxxxxxxxx xxxxxxxxxxxx xxxxxxxx xxxxx. Xxx x xxxxxx xxxxxxxxx xxxxxxxx xxxxxxxxx, x xx xxxxxxx v učebnicích, xxxxxxxxxxx xxxxxx, xxxxxxxxx xxxxxx apod. Není xxxxxxxx xxxxxxx, xxx xxxxxxx xxxxxxxxx xxxxxxxx xxxxx, tzn. xxxxxx xxxxx i xxxxxxxxxxx xxxxx.
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