okay let me show you how it gets to EBA
1) engine connect to A
2) they come back and turn from 25m corner and drops A at 10m corner
3) now engine takes the long route from 25m -1000 m corner and connects to B (EB)
4) engine pushes B back and connects to A which is at 10m corner
and you get EBA.
4) now they come back with Engine in front towards 1000 m corner
5)turn from there towards original position of A with A in front
6) leave A there and again turn from 1000 m corner and puts B at 10 m corner
7) E again comes from 1000 m corner and connects to A... Drops A at original position of B
... you guys can do the rest.......
Think again dude ... when engine coonects to B and pushes B back then it will reach 25m corner where B is on left side and Engine on right. So, the respective postions will be BEA... Engine will be in center not left. Think again and u will find u r wrong