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Ships containing U-21
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Abbekerk
Abercrombie
Achilles
Active
Ad Astra
Ada
Adelaide
Adhara
Adirondack
Adventure
Adventuress
Aeolus
Afac Queen
Afrika
Alaskan
Alba
Albacore
Albatross
Albion
Alert
Alexander
Alexandra
Alfred
Alibi
Alice
Allen
Alliance
Alligator
Almirante
Alonzo
Alpha
Altair
Amazone
Amberjack
Amelia
America
American
Amerika
Amiral Charner
Amity
Amphitrite
Amsterdam
Ancon
Andromeda
Angelina
Angler
Anglo Saxon
Anna
Anna Maria
Annavore
Anne
Antaeus
Antares
Apex
Apollo
Aquarius
Aquila
Ara
Archer
Archimedes
Ardent
Arethusa
Argo
Argus
Ariadne
Ariel
Arrow
Arrowhead
Artemis
Arthur
Ashantian
Asheville
Ashworth
Asia
Astara
Atalanta
Athena
Atlantic
Atlas
Attack
Aurora
Australia
Ava
Avalon
Baikal
Bailey
Bald Eagle
Baltimore
Barbara
Baron
Barracuda
Bayard
Bayonne
Beagle
Beaver
Belfast
Belknap
Bell
Benwyvis
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