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(as defined in article 1.23 of the Banking Consolidation Directive (Definitions)) and in relation to an undertaking in a consolidation group, sub-group or another group of persons) an undertaking complying with the following conditions:(a) its principal activity consists in:(i) owning or managing property;(ii) managing data-processing services; or(iii) any other similar activity;(b) the activity in (a) is ancillary to the principal activity of one or more credit institutions; and