sentences:  Unicode provides code points for some characters or groups of characters which are modified only for aesthetic reasons (such as ligatures, the half-width katakana characters, or the double-width Latin letters for use in Japanese texts), or to add new semantics without losing the original one (such as digits in subscript or superscript positions, or the circled digits (such as "①") inherited from some Japanese fonts).Such a sequence is considered compatible with the sequence of original (individual and unmodified) characters, for the benefit of applications where the appearance and added semantics are not relevant.However the two sequences are not declared canonically equivalent, since the distinction has some semantic value and affects the rendering of the text.