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fe'u cadwyd yn gyfrinachol hyd nes i as y democratiaid rhyddfrydol vince cable lwyddo i gael manylion gan postwatch , nid gan swyddfa'r post -- ac mae hynny , ynddo'i hun , yn achosi pryder
they were kept secret until liberal democrat mp vince cable managed to obtain details from postwatch , not from the post office -- and that , in itself , causes concern