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We define the Hochschild homology groups of a group ring ZG
relative to a family of subgroups F of G.
These groups are the homology groups of a space which can be described
as a homotopy colimit, or as a configuration space, or,
in the case F is the family of finite subgroups of G,
as a space constructed from stratum preserving paths.
An explicit calculation is made in the case G is the infinite
dihedral group.
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