1 <html xmlns=
"http://www.w3.org/1999/xhtml">
3 <math xmlns=
"http://www.w3.org/1998/Math/MathML"
4 xmlns:
h=
"http://www.w3.org/1999/xhtml">
5 <msup style=
"display:block"><mo><h:frameset/></mo></msup>
6 <msub style=
"display:block"><mo><h:frameset/></mo></msub>
7 <msubsup style=
"display:block"><mo><h:frameset/></mo></msubsup>