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copied!<p>It is very unclear what you are asking to do here.</p> <ul> <li><p>There are characters whose <strong>canonical decompositions</strong> all start with the same base character: e, é, ê, ë, ē, ĕ, ė, ę, ě, ȅ, ȇ, ȩ, ḕ, ḗ, ḙ, ḛ, ḝ, ẹ, ẻ, ẽ, ế, ề, ể, ễ, ệ, e̳, … <em>or</em> s, ś, ŝ, ş, š, ș, ṡ, ṣ, ṥ, ṧ, ṩ, ….</p></li> <li><p>There are characters whose <strong>compatibility decompositions</strong> all include a particular character: ᵉ, ₑ, ℯ, ⅇ, ⒠, ⓔ, ㋍, ㋎, ｅ, … <em>or</em> s, ſ, ˢ, ẛ, ₨, ℁, ⒮, ⓢ, ㎧, ㎨, ㎮, ㎯, ㎰, ㎱, ㎲, ㎳, ㏛, ﬅ, ﬆ, ｓ, … <em>or</em> R, ᴿ, ₨, ℛ, ℜ, ℝ, Ⓡ, ㏚, Ｒ, ….</p></li> <li><p>There are characters that <strong>just happen to look alike</strong> in some fonts: ß and β and ϐ, <em>or</em> 3 and Ʒ and Ȝ and ȝ and ʒ and ӡ and ᴣ, <em>or</em> ɣ and ɤ and γ, <em>or</em> F and Ϝ and ϝ, <em>or</em> B and Β and В, <em>or</em> ∅ and ○ and 0 and O and ০ and ੦ and ౦ and ૦, <em>or</em> 1 and l and I and Ⅰ and ᛁ and | and ǀ and ∣, ….</p></li> <li><p>Characters that are the same <strong>case-insensitively</strong>, like s and S and ſ, <em>or</em> ss and Ss and SS and ß and ẞ, ….</p></li> <li><p>Characters that all have the same <strong>numeric value</strong>, like all these for the value <em>1</em>: 1¹١۱߁१১੧૧୧௧౧౹౼೧൧๑໑༡၁႑፩១៱᠑᥇᧑᧚᪁᪑᭑᮱᱁᱑₁⅟ ① ⑴ ⒈ ⓵ ❶➀➊꘡꣑꤁꧑꩑꯱ Ⅰⅰꛦ㆒㈠㊀.</p></li> <li><p>Characters that all have the same <strong>primary collation strength</strong>, like all these that are the same as <em>d</em>: DdÐðĎďĐđ◌ͩᴰᵈᶞ◌ᷘ◌ᷙḊḋḌḍḎḏḐḑḒḓⅅⅆⅮⅾ Ⓓ ⓓ ꝹꝺＤｄ . Note that some of those are not accessible through any kind of decomposition, but only through the DUCET/UCA values; for example, the fairly common ð or the newish ꝺ can be equated to d only through a primary UCA strength comparison; same with ƶ and z, ȼ and c, etc.</p></li> <li><p>Characters that are same in certain <strong>locales</strong>, like æ and ae, <em>or</em> ä and ae, <em>or</em> ä and aa, or MacKinley and McKinley, …. Note that locale can make a really big difference, since in some locales both c and ç are the same character while in others they are not; similarly for n and ñ, <em>or</em> a and á and ã, ….</p></li> </ul> <p>Some of these can be handled. Some cannot. All require different approaches depending on different needs.</p> <p>What is your real goal?</p>

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