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diff --git a/doc/manual/src/expressions/arguments-variables.md b/doc/manual/src/expressions/arguments-variables.md
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-# Arguments and Variables
-
-The [Nix expression for GNU Hello](expression-syntax.md) is a
-function; it is missing some arguments that have to be filled in
-somewhere. In the Nix Packages collection this is done in the file
-`pkgs/top-level/all-packages.nix`, where all Nix expressions for
-packages are imported and called with the appropriate arguments. Here
-are some fragments of `all-packages.nix`, with annotations of what
-they mean:
-
-```nix
-...
-
-rec { ①
-
-  hello = import ../applications/misc/hello/ex-1 ② { ③
-    inherit fetchurl stdenv perl;
-  };
-
-  perl = import ../development/interpreters/perl { ④
-    inherit fetchurl stdenv;
-  };
-
-  fetchurl = import ../build-support/fetchurl {
-    inherit stdenv; ...
-  };
-
-  stdenv = ...;
-
-}
-```
-
-1.  This file defines a set of attributes, all of which are concrete
-    derivations (i.e., not functions). In fact, we define a *mutually
-    recursive* set of attributes. That is, the attributes can refer to
-    each other. This is precisely what we want since we want to “plug”
-    the various packages into each other.
-
-2.  Here we *import* the Nix expression for GNU Hello. The import
-    operation just loads and returns the specified Nix expression. In
-    fact, we could just have put the contents of the Nix expression
-    for GNU Hello in `all-packages.nix` at this point. That would be
-    completely equivalent, but it would make `all-packages.nix` rather
-    bulky.
-    
-    Note that we refer to `../applications/misc/hello/ex-1`, not
-    `../applications/misc/hello/ex-1/default.nix`. When you try to
-    import a directory, Nix automatically appends `/default.nix` to the
-    file name.
-
-3.  This is where the actual composition takes place. Here we *call* the
-    function imported from `../applications/misc/hello/ex-1` with a set
-    containing the things that the function expects, namely `fetchurl`,
-    `stdenv`, and `perl`. We use inherit again to use the attributes
-    defined in the surrounding scope (we could also have written
-    `fetchurl = fetchurl;`, etc.).
-    
-    The result of this function call is an actual derivation that can be
-    built by Nix (since when we fill in the arguments of the function,
-    what we get is its body, which is the call to `stdenv.mkDerivation`
-    in the [Nix expression for GNU Hello](expression-syntax.md)).
-    
-    > **Note**
-    > 
-    > Nixpkgs has a convenience function `callPackage` that imports and
-    > calls a function, filling in any missing arguments by passing the
-    > corresponding attribute from the Nixpkgs set, like this:
-    > 
-    > ```nix
-    > hello = callPackage ../applications/misc/hello/ex-1 { };
-    > ```
-    > 
-    > If necessary, you can set or override arguments:
-    > 
-    > ```nix
-    > hello = callPackage ../applications/misc/hello/ex-1 { stdenv = myStdenv; };
-    > ```
-
-4.  Likewise, we have to instantiate Perl, `fetchurl`, and the standard
-    environment.