Commands like @fail, @ofail, @success, and @osuccess set messages 
to be displayed when a player fails or succeeds in manipulating an 
object or exit. To make sense, these messages must contain the 
correct pronouns. Use one of the substitutions in the place of a 
pronoun, and the correct text will be inserted into the message 
when it's displayed. If the substitutions are capitalized, the 
output will also be capitalized.

Some functions let you set your own substitutions; to reference
them if their name is longer than one character, use %{braces}.

To see a list of all the available substitutions, type 'help subs-list'.