CONTEXT DEPENDENCE
1.1   M: all right system
1.2   : we've got a more complicated problem
1.4   : first thing _I'd_ like you to do
1.5   : is send engine E2 off with a boxcar to Corning to pick up oranges
1.6   : uh as soon as possible
2.1   S: okay
3.1   M: and while it's there it should pick up the tanker
4.1   S: okay
4.2   : and that can get
4.3     : we can get that done by three
5.1   M: good
5.3   : can we please send engine E1 over to Dansville to pick up a boxcar
5.4   : and then send it right back to Avon
6.1   S: okay
6.2   : it'll get back to Avon at 6