13 <math
><tr
><td
><mo
><tr
>
24 <math
><thead
><mo
><tbody
>
34 <math
><tfoot
><mo
><tbody
>
44 <math
><tbody
><mo
><tfoot
>
54 <math
><tbody
><mo
></table
>
64 <math
><thead
><mo
></table
>
74 <math
><tfoot
><mo
></table
>