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    $A[$_]        -- the element of @A at the current index
    $First{ $A[$_] }    -- the previous line is a key in %First
    @{ }            -- and the associated value is an anonymous array
    
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    Elements of @A:
    0    zero
    1    one
    ...
    zero    [ 0 ]
    one    [ 1 ]
    two    [ 2 ]