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Lemma dependency for Specification directory-tree-inst

A lemma (entry) may depend on lemmas (entries) below its position, but never on lemmas above its position. This means the list is a topological order of the dependency graph. An entry 'all subs proved' means that all used lemmas are (transitively) proved.

Name:	Status:	Subs proved?	Used:
Del-rec-other	proved	all subs proved	read-notin,
Del-rec-same	proved	all subs proved	read-notin,
Del-empty	proved	all subs proved	read-notin,
read-notin	proved	all subs proved