Consider four survivors on an island. 
Which of the following pairs of survivors has a double-coincidence of wants?
Definitions:
Blank Indorsement
An indorsement made by a signature alone, with no particular indorsee, written on a negotiable instrument.
Warranties by Indorsers
Guarantees made by indorsers about the validity and enforceability of negotiable instruments.
Alteration
A change or modification made to an object, document, or system, often intended to improve functionality or appearance.
Foreign Draft
A financial instrument used in international trade, drawn by an exporter on a foreign buyer, which orders the payment of a specified amount of money.
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