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Those worries have mounted after a weekend deal to bailout Cyprus.
The euro fell past reported option barriers at $1.2825 to drop to its lowest in four months at $1.28175, down 0.3 percent on the day. Asian bids are cited at $1.2800, traders said.
So far this year, the euro has shed nearly 3 percent against the dollar as the euro zone debt crisis returned to investors' radar.