The ``enterprise'' for purposes of enterprise coverage under section
3(s) and the exemption provision in section 7(b)(3), is defined in
section 3(r) (Sec. 794.106) in terms of the activities in which it is
engaged. All the ``related activities'' which are ``performed * * * by
any person or persons for a common business purpose'' are included if
they are performed ``either through unified operation or common
control.'' This is true even if they are performed by more than one
person, or in more than one establishment or by more than one corporate
or other organizational unit. The definition specifically includes as a
part of the enterprise, departments of an establishment operated through
leasing arrangements. These statutory criteria are discussed in more
detail in subsequent sections.