Numbers 9 and 0 are reserved for two long, silver shoulder buttons on either end of the device's top edge.

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The attractive row houses nearby are now selling for double or more their purchase value, especially in the area that borders neighbouring Columbia Heights, whose attractive brownstones stand shoulder to shoulder with new high-end condos.

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Djokovic, meanwhile, had to take time out due to the back and shoulder injuries which have plagued the end of his sensational season.

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