flex - arraycollection unique var -

how create new arraycollection can generate unique variable name?

like:

ac+nu in ac1:arraycollection ac+nu in ac2:arraycollection ac+nu in ac3:arraycollection ac+nu in ac4:arraycollection nu++; 

i think want:

var ac1:arraycollection = new arraycollection(sourcearraycollection.list); var ac2:arraycollection = new arraycollection(sourcearraycollection.list);