is a hash. If the key $candidate
is not present in the hash, it is added to the hash (that's called "autovivification"), initialized to 1, and undef
is returned - the redo
is not executed.
On the other hand if the key is already present in the hash, the corresponding value (for example 1) is returned, and incremented by one (for example set to 2). In this case the interesting part is not the incrementing, but that it returns a true value, so the redo is executed.
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