SAS programming: variable lists

Numbered range list: foo1-foo5 is a short hand for foo1,foo2,foo3,foo4,foo5.

Name prefix lists: sum(of foo:) calculates the summ of all variables that start with foo.

Name range lists: baz--bar refers to all variables that were declared (or defined) between the declaration of baz and bar, inclusiely bar.

baz-numeric-bar refers to the numeric variables in that range.

baz-character-bar refers to the character variables in that range.

_numeric_, _character_ and _all_ to refer to variables of a specific type or to all variables.