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Search for Calendars (no constraints) will yield a list of all Calendars in your database.

Now, you can put a constraint on that Search to limit the Calendars that are returned.

No matter how how many Calendars this returns, the list of Calendars will always be a list.

“Search for Calendars (whatever constraints)” always returns a list. Note that a list can have any number of items in it, including zero items.

Whatever the search constraints are, Search for Calendars is the list of Calendars.

That’s your list.

If you want just a single item from the list, you can do many things. For example, the first item in that list would be:

Search for Calendars: first item

Alternatively that same item could be referred to as:

Search for Calendars: Item #1

Note that, in the case of a list with zero items, both of those expressions would resolve to empty.