-keywords are defined. If the group contains keyword `:with' , the backends
-listed after this keyword are ignored for the purpose of `prefix'
-command. If a grouped backend contains keyword `:sorted', the
-final (merged) list of candidates is not sorted.
+keywords are defined. If the group contains keyword `:with', the backends
+listed after this keyword are ignored for the purpose of the `prefix'
+command. If the group contains keyword `:sorted', the final list of
+candidates is not sorted after concatenation.