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Helping out The Underground Map (TUM) project (Step 2 of 5)

Before continuing, we need to prove that you are human by asking a couple of questions of you...
(We are aware that this is a complete pain in the %*@%& but it help guard against thusands of comments offering viagra and get-rich-quick schemes
Name a station at the end of the Northern Line...
Edgware
Debden
Upminster Bridge
Osterley
Monument
If you need to check a fact, you can view a tube map here