SRL for [unwind]: And senior officials of two U.S. securities houses say they switched trades in European stocks to the London market last week when they could n't [unwind] positions on the Continent .
R-ARG-M-TMP: when | ARG-0: they | ARG-M-MOD: could | ARG-M-NEG: n't | ARG-1: positions on the Continent | ARG-M-TMP: last week