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keystone
used in The Bourne Supremacy

only 1 use
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Definition
something of importance upon which other things depend

or:

architecture or masonry:  the central building block at the top of an arch or vault (providing pressure to lock the other blocks into place)
  • Keystone should be so lucky.
    Chapter 12 (93% in)

There are no more uses of "keystone" in The Bourne Supremacy.

Typical Usage  (best examples)
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