!! +var+ +exec+ +string+
tit:append
type:$type_both
syntax:!append ``object s1'' to ``str''
mean:String manipulation: append object ``s1'' to the string ``str''; ``object'' may be ``item'', ``word'',\
  ``line'', ``colon'' or ``semicolon''. The object ``s1'' should not be empty before evaluation.
