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Return the positions (longitude,latitude) of all the specified members of the
geospatial index represented by the sorted set at _key_.
Given a sorted set representing a geospatial index, populated using the `GEOADD`
command, it is often useful to obtain back the coordinates of specified members.
When the geospatial index is populated via `GEOADD` the coordinates are
converted into a 52 bit geohash, so the coordinates returned may not be exactly
the ones used in order to add the elements, but small errors may be introduced.
The command can accept a variable number of arguments so it always returns an
array of positions even when a single element is specified.
@return
@array-reply, specifically:
The command returns an array where each element is a two elements array
representing longitude and latitude (x,y) of each member name passed as argument
to the command.
Non existing elements are reported as NULL elements of the array.
@examples
```cli
GEOADD Sicily 13.361389 38.115556 "Palermo" 15.087269 37.502669 "Catania"
GEOPOS Sicily Palermo Catania NonExisting
```
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