numbers: <b><i>bolditalic</i></b><b>bold</b><i>italic</i>roman
letters: <b>bold</b><i>italic</i><b>back</b><b><i>bolditalic</i></b>roman
multiletter: <b>bold</b>empty<i>italic</i>back<b><i>bolditalic</i></b>roman
typewriter: <span class="Li">roman</span><span class="Li"><b>bold</b></span><span class="Li">roman</span><span class="Li"><i>italic</i></span>roman