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1. Not a comprehensive digital network service.

1. Was a comprehensive digital network of services.

1. ISDN

1. Integrated Services Digital Network's; ISDN's

1. It is not ISDN.

1. It's not the Integrated Services Digital Network.

1. It was a comprehensive digital network service.

1. Service Integrated Digital Network.

1. Is not a comprehensive digital network service.; It is not a comprehensive digital network service.

1. Wasn't the comprehensive digital network of services.

1. Probably a comprehensive digital network service.

1. Was not a comprehensive digital network.; Was not ISDN.

1. Wasn't the Integrated Services Digital Network.; Wasn't a comprehensive digital network.

1. Probably Integrated Services Digital Network.

1. Was not a comprehensive digital network service.; Was not the comprehensive digital network.

1. if/when it were a comprehensive digital network of services; if/when it's a comprehensive digital network of services

1. if it were a comprehensive digital service network; if the comprehensive digital service network existed

1. If/when the Integrated Services Digital Network…; When the ISDN…