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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: ispell and flyspell
Date: Sat, 02 Jan 2021 18:23:11 +0200
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> From: wael-zwaiter@gmx.com
> Cc: help-gnu-emacs@gnu.org
> Date: Sat, 2 Jan 2021 16:35:35 +0100
> 
> Have written the following function, but (ispell-region) is failing.
> How can I make option 2 call (ispell-region) on the current paragraph.
> [...]
>     (2 (ispell-region)

When you call a function, it is highly recommended to consult its doc
string, so you see what arguments it requires and what is the meaning
of each argument.  You _must_ supply the mandatory arguments, they
cannot be omitted when calling from Lisp.