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pointer: a value that refers to another object
non-null-pointer: a pointer whose value is not zero
boolean strcmp (nnsp a, nnsp b): takes two non-null
string pointers and returns TRUE if the strings are equal
sp x, y;
b = strcmp (x,y);
create a data structure filled with default values
known to conform to the required assertions.
## at this point, we can assume that the structure conforms
## to the assertions, whether the input was valid or not
%templates = (
1 => "template one: data = #DATA#",
$t =~ s/#DATA#/$d/;
print $t, "\n";
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