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For a set L⊆(R⩾02) of two-element sets of non-negative real numbers we consider rooted strict binary trees with the property that the two edges leading from every non-leaf to its two children are assigned lengths l1 and l2 with {l1,l2}∈L.For choices of L for which l1+l2 is constant for every {l1,l2}∈L which models that a certain total length can be distributed with some degree of freedom specified...
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