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An Addition Chain for which there is a Subset 
of members such that each member of the chain
uses the largest element of which is less than the member.
See also Addition Chain, Brauer Chain, Hansen Number
References
Guy, R. K. ``Addition Chains. Brauer Chains. Hansen Chains.'' §C6 in
Unsolved Problems in Number Theory, 2nd ed. New York: Springer-Verlag,
pp. 111-113, 1994.