Can you tell the difference between VAR X1 – X3 and VAR X1 — X3?

by

When you specify sing dash between the variables, then that specifies consecutively numbered variables. Similarly, if you specify the Double Dash between the variables, then that would specify all the variables available within the dataset.

For Example:
Consider the following data set:

Data Set: ID NAME X1 X2 Y1 X3

Then, X1 – X3 would return X1 X2 X3

and X1 — X3 would return X1 X2 Y1 X3