(@buy @sell)
%100
+1
+40
[@main]
ӭ٣ʲôҪҰæ\
\ \
</@buy>\
</@sell>\
<˳/@exit>
[@buy]
ѡҪƷ\
\ \
</@main>
[@sell]
Ʒʺõ⣬Ұɡ\
һüǮ\
\ \
</@main>
[goods]
 20 5