...instantiations. 

This is, they automatically generate files which perform manual instantiation from g++'s point of view. Manual instantiation reduces the burden placed on the compiler and linker during compilation.

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...G 

An induced subgraph of a graph G = (V,E) is another graph G' = (V',E'), where $V' \subseteq V$ and E' consists of those edges in E whose vertex sets are entirely contained in V'.

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