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when, if whether, whether if, whether whether, if
whether does it often snow whether it often snows if it often snow if does it snow
that; that that; whether if; that if; whether
determined sure sorry glad
is, if is, whether are , whether are, that
whether does it often snow whether it often snows if it often snow if does it snow
that, When that, If if, Whether whether, When
that ; that that ; whether if ; whether whether ; whether
whether Bob will come if will Bob come whether Bob would come if Bob would come
if；If whether；Whether whether；If A.&C
that ; that that ; whether if ; that if ; whether
determined sure sorry glad
that ; that that ; whether if ; whether whether ; whether
exact denied sure definite
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