Similar to schematic illustration found in Joshi and Shabes (1991, Fig. 2)
Aravind K. Joshi, Yves Schabes: Tree-Adjoining Grammars and Lexicalized Grammars. University of Pennsylvania Department of Computer and Information Science, URL: https://repository.upenn.edu/handle/20.500.14332/7375
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Captions
Tree adjoining grammar: Operation of substitution
Tree Adjoining Grammar (Baumadjunktionsgrammatik): Operation der Substitution schematisch dargestellt