some display environments may be indistinguishable from one or both of the previous alternatives. However, this option requires the storage of three separate characters (U+05D9 U+05B7 U+05D9). As a fourth alternative, albeit the least stable typographically, the second of two consecutive yudn may be pointed ייַ (U+05D9 U+05D9 U+05B7). A pasekh yud is otherwise not part of any established Yiddish character repertoire, and its use in this context manifests conditions that are specific to computerized typography. The four possible representations of the pasekh tsvey yudn thus have even greater potential for causing confusion than do the other digraphs. A further potentially confusing option specific to computerized text production, but not a component of any Yiddish orthographic tradition, is the combination of a khirik with a tsvey yudn ligature to represent the consonant-vowel sequence yud — khirik yud, as ײִ (U+05F2 U+05B4) rather than the correct ייִ (U+05D9 U+05D9 U+05B4). Combining marks Fonts that support Hebrew script do not always correctly render the combining points that are specific to Yiddish (and in many cases have general difficulty with Hebrew marks). Some applications display extraneous blank space adjacent to a letter with such a mark, and the mark may be displayed in that space rather than properly positioned with the base character. Writing text for presentation in a reading environment that has unknown font resources — as will almost invariably be the case with HTML documents — thus needs special care. Here again, this is not simply a matter of typographic preference. The disjunction of combining and base characters can easily lead to error when character sequences are copied from one application into another. The same alternative modes of entry that are illustrated above with the pasekh tsvey yudn are available for all of the other pointed characters used in Yiddish, with largely indistinguishable visual results but with differing internal representations. Any such character that appears on either a physical or a virtual keyboard will normally be recorded as a two-character sequence consisting of the base character followed by the combining mark. If a graphic character selector is used that does not emulate a keyboard, the desired character will be chosen from a table on the basis of its appearance. Since such facilities display combining marks separately from base characters, it is likely that the precomposed character form of a character will be the more readily recognized of the alternatives. Most applications