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In AutoGen, every name is implicitly an array of values. When assigning values, they are usually implicitly assiged to the next highest slot. They can also be specified explicitly:
| mumble[9] = stumble; mumble[0] = grumble; | 
If, subsequently, you assign a value to mumble without an
index, its index will be 10, not 1.
If indexes are specified, they must not cause conflicts.
#define-d names may also be used for index values.
This is equivalent to the above:
| #define FIRST 0 #define LAST 9 mumble[LAST] = stumble; mumble[FIRST] = grumble; | 
All values in a range do not have to be filled in. If you leave gaps, then you will have a sparse array. This is fine (see section 3.6.13 FOR - Emit a template block multiple times). You have your choice of iterating over all the defined values, or iterating over a range of slots. This:
| [+ FOR mumble +][+ ENDFOR +] | 
iterates over all and only the defined entries, whereas this:
| [+ FOR mumble (for-by 1) +][+ ENDFOR +] | 
will iterate over all 10 "slots". Your template will likely have to contain something like this:
| [+ IF (exist? (sprintf "mumble[%d]" (for-index))) +] | 
or else "mumble" will have to be a compound value that, say, always contains a "grumble" value:
| [+ IF (exist? "grumble") +] |