Syntax :
INDEX ( reference, row_num[, column_num [, area_num]]) INDEX ( array, row_num[, column_num])
| reference | typically an area reference, possibly a union of areas |
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| array | a literal array value (currently not supported) |
| row_num | selects the row within the array or area reference |
| column_num | selects column within the array or area reference. default is 1 |
| area_num | used when reference is a union of areas |
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