'seek' doesn't care whether the key exists or not. It just arranges for the next use of each (actually, adding a way to reverse 'each' would be prudent as well) finds the earliest key greater than or equal to the key given to 'seek'. For convenience of interface, 'seek' might return something which might be different depending on whether the requested key exists or not, but those are details best left to the (unknown) implementor.
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