* Expressions:: Numeric and string expression syntax.
* Data Input and Output:: Reading data from user files.
-* System and Portable Files:: Dealing with system & portable files.
+* System and Portable File IO:: Reading and writing system & portable files.
+* Combining Data Files:: Combining data from multiple files.
* Variable Attributes:: Adjusting and examining variables.
* Data Manipulation:: Simple operations on data.
* Data Selection:: Select certain cases for analysis.
@include expressions.texi
@include data-io.texi
@include files.texi
+@include combining.texi
@include variables.texi
@include transformation.texi
@include data-selection.texi