BRUSSELS/BERLIN (Reuters) - Euro zone countries continued to grapple with the thorny issue of involving the private sector in tackling Greece's debt pile as they prepared for a meeting to decide support for the country next week. (http://feeds.feedburner.com/~ff/reuters/topNews?d=yIl2AUoC8zA) (http://feeds.feedburner.com/~ff/reuters/topNews?i=_LGCPEd7lZM:HCcRSDQiFN0:V_sGLiPBpWU) (http://feeds.feedburner.com/~ff/reuters/topNews?i=_LGCPEd7lZM:HCcRSDQiFN0:-BTjWOF_DHI) (http://feeds.feedburner.com/~r/reuters/topNews/~4/_LGCPEd7lZM)