PROC TABULATE Operators:

(blank)
places the output for each element immediately after the output for the preceding element. This process is called concatenation.
,
comma: separates dimensions of a table, crosses elements across the dimensions.
*
asterisk: crosses elements within a dimension.
()
parentheses: groups elements so that another operator can be applied to the whole group.
<>
brackets: specifies a denominator definition.
=
equal sign: assigns a label or format modifier to a variable or statistic.

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