Portuguese worries hit demand at Greek debt sale, bruise periphery

* Portugal's worries about BES group have regional reverberations * Greek three-year debt sale sees lacklustre demand * Irish, Spanish sales go smoothly as markets differentiate (Adds more detail on Portugal, fresh comments, updates prices) LONDON, July 10 (Reuters) - Concern about the health of a parent company of Portugal's largest bank hurt bonds from the euro zone's periphery on Thursday ...

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