1.   But investors jittery about the economy later took profits and unwound arbitrage positions, pushing share prices lower.

2.   But investors jittery about the economy later took profits and unwound arbitrage positions, driving share prices down.

3.   Share prices fell as traders unwound arbitrage positions and took profits.

4.   Share prices were falling as traders unwound arbitrage positions built up over the last few trading days last week.

5.   Stock prices slipped in Tokyo Monday as traders unwound arbitrage positions in thin dealings.

6.   Stock prices slipped Monday morning in Tokyo as traders unwound arbitrage positions in thin dealings.