Many fonts draw the fraction slash (and the division slash) less vertical than the slash. The separate encoding is also intended to permit automatic formatting of the preceding and succeeding digits by glyph substitution with numerator and denominator glyphs (e.g., display of "1, fraction slash, 2" as "½"), though this is not yet supported in many environments or fonts. Because of this lack of support, some authors still use Unicode subscripts and superscripts to compose fractions, and many fonts design these characters for this purpose. In addition, all of the multiples less than 1 of 1⁄n for 0 < n ≤ 6 and n = 8 (e.g. 2⁄3 and 5⁄8), as well as 1⁄7, 1⁄9, and 1⁄10, are in the Unicode Number Forms block as precomposed characters.