 The typesetting software TeX treats horizontal runs of whitespace as a single space, but uses a heuristic to recognize sentence endings—typesetting the spaces after them slightly wider than a normal space.This is the default for TeX, although the "\frenchspacing" TeX macro will disable this feature in favor of using the same amount of space between sentences as it does between words.Computer word processors will allow the user to input as many spaces as desired.