<\body> In the menus , , and you will find different primitives for computing with integers, strings, tuples and boolean values. For instance, in the following code, the tag defines a new ``important tag'' as well as a variant in red: <\tm-fragment> >|>>>>|-red>>|>>>>>>>>> Here we use the primitive in order to concatenate two strings. The different computational primitives are described in more detail in the on the primitives|../../format/primitives/primitives.en.tm>. <\initial> <\collection>