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Μούνη γὰρ ἄγειν οὐκέτι σωκῶ λύπης ἀντίρροπον ἄχθος → I have no longer strength to bear alone the burden of grief that weighs me down
Use adj. P. πρόδρομος (also Euripides, Iphigenia in Aulis 424, but the passage is doubtful).