The input is free format. Comments are enclosed between ( ), e.g.
(this is comment only). The input should consist of an initialization
part and a data part, separated by end_initia and ended by
end_data
initialization
... initialization end_initia data_item index data_values
... data_item index data_values end_data
Bold printed data in this manual can be used literally. Italic
printed data is only symbolic (it represents a number or a word).