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Figure 6.
A Pair SCFG with nonterminals Φ1234 and terminals Ωa ∪ Ωd for generating pairwise alignments of Structure Trees for an ancestor and a descendant. Here W, X, Y, Z ∈ Ω are generic terminal symbols.
Holmes BMC Bioinformatics 2004 5:166 doi:10.1186/1471-2105-5-166
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