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Comparison of the BHG and the barrier tree for a small RNA molecule. The vertex set of the BHG (top) comprises the 15 LMs of the input and two additional LMs 16 and 17 discovered by BHGbuilder. The barrier tree generated with barriers (below) contains only the 15 input LMs. Secondary structure drawings were produced with VARNA (Darty et al., 2009)
