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When you define a macro with simple parameters, as in these examples,
you must be careful not to put blank spaces before the '{' that begins the
replacement text. For example, \def\row #1 #2 {...} will not give the same result
as \def\row#1#2{...}, because the spaces after #1 and #2 tell TeX to look for
arguments that are followed by spaces. (Arguments can be "delimited" in a fairly
general way, as explained below.) But the space after \row is optional, as usual,
because TeX always disregards spaces after control words.
After you have said \def\row#1#2{...},
you are allowed to put spaces between the arguments (e.g., \row x n),
because TeX doesn't use single spaces as undelimited arguments.
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