Presented here in conversation, guitarists Frannie Holder (Dear Criminals, Random Recipe) and Éléonore Pitre (Rosier, Star Académie house band) discuss the pandemic as a moment to reflect on their lives musicians focus more “why” of work. Both also describe singular experience performing person during pandemic..

We consider hierarchical systems where nodes represent entities and edges represent binary relationships among them. An example is a hierarchical composition of Web services where the nodes denote services and edges represent the parent-child relationship of a service invoking another service. A fundamental issue to address in such systems is, for two nodes X and Y in the hierarchy whether X ca...