Another way that avoids a named array.

$entries = @{[ split /\s+/ ]};
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Also, split /\s+/ is the similar to as the slightly magical split ' ', except undefs from leading whitespace are suppressed.

In turn, split ' ' is the same as split with no arguments, so you could reduce your code to:

$entries = @{[ split ]};
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If you don't have leading whitespace, or don't want to count the undef any leading whitespace would produce as an entry.