:Ԥı
:,,Ч
:reply
reply1 reply2 ...
ѧΪ <tt>reply</tt> Ļشı

:choice
choice1 choice2 ...
ѧΪ <tt>choice</tt> Ļشı

:step
step
ı (ʹ <tt>\steps</tt>  <tt>\nextstep</tt> ʱ).

:sc_reply
sc_reply1 sc_reply2 ...
ӳشӳ̶ȵı, ȡֵ 0  1 .

:help_subject
help_subject
ⷽ <tt>help</tt> İʶı
