Question: Does table have a predefined function to get indices of a specific entry?

Consider an easy example of a table.


We can give an index to it and get its corresponding entry if exists.


We can also get the set of all indices, or the set of all entries. But what about receiving the index or set of indices with a specific entry. for example asking what indices have the entry `1`?

Of course I can define a search procedure myself, but I thought there might be an efficient way which is already implemented as a function/method on tables.

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