Prefixes starting with <Ex>
<Ex >
.
<ExC>
.
<Exa>
.
<Exc>
.
<Exe>
.
<Exh>
.
<Exi>
.
<Exm>
.
<Exo>
.
<Exp>
.
<Exs>
.
<Ext>
.
<Exu>
.
<Exx>
.
<Ex> (other)
.