Committee member \(W\) wants to schedule a one-hour meeting on Thursday for himself and three other committee members,

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Committee member \(W\) wants to schedule a one-hour meeting on Thursday for himself and three other committee members, \(X,\) \(Y,\) and \(Z.\) Is there a one-hour period on Thursday that is open for all four members?

(1) On Thursday \(W\) and \(X\) have an open period from 9:00 a.m. to 12:00 noon.
(2) On Thursday Y has an open period from 10:00 a.m. to 1:00 p.m. and \(Z\) has an open period from 8:00 a.m. to 11:00 a.m.

[spoiler]OA=C[/spoiler]

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