# File lib/facet/lisp-format.rb, line 910
        def execute(state)
          arg = colon_mod? ? state.previous_arg : state.next_arg
          if at_mod?
            state.output((arg.eql? 1) ? 'y' : 'ies')
          else
            state.output(?s) unless arg.eql? 1
          end
        end