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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from The Underground City by Jules Verne: we shall try to find it, and you must help us."
"You'll get into a scrap if you don't take care, Mr. Ford!"
responded Jack Ryan.
"We'll see about that, Jack!"
We may easily imagine how soon this domain of New Aberfoyle became
familiar to all the members of the Ford family, but more particularly
to Harry. He learnt to know all its most secret ins and outs.
He could even say what point of the surface corresponded with what point
of the mine. He knew that above this seam lay the Firth of Clyde,
that there extended Loch Lomond and Loch Katrine. Those columns supported
a spur of the Grampian mountains. This vault served as a basement
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