Prefixes starting with <ex>
<ex >
.
<exa>
.
<exc>
.
<exe>
.
<exf>
.
<exh>
.
<exi>
.
<exo>
.
<exp>
.
<exq>
.
<exs>
.
<ext>
.
<exu>
.
<ex> (other)
.