There is something interesting going on when I use the reverse function and the stack function. Then use the include function. Although I'm not sure if reverse is coming into play.

When I use eval with stack all problems go away. I tried using eval only with the reverse function but still have problems.

Take a look at the attached files and hopefully you will understand my issues, if not I can try to explain them better.

Put these in the same folder:
Stack1.sm (17 KiB) downloaded 34 time(s).
Stack2.sm (11 KiB) downloaded 31 time(s).

Falling objects go from top to bottom.
Elevation goes from bottom to top as per the construction.
Just a comment: too many gyzmas in the work sheet
Why 'n#' instead of 'n'
Nothing more confusing than a ladder of subscripts [4]
confusing with indices. Z', Z'' purely decorative [Z1, Z2]

eval(,) goes mostly with function(s), you have none, just arithmetics.

Jean

Thanks for the replies!

Ioan - I will try to incorporate your method. I should give read/write a try. It seams to be more robust and I would have more control. However it will be a bit more difficult to setup and a bit more messy (in the worksheet and in the folder).