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  1. or download this
    lower_prec_expr : higher_prec_expr lower_prec_op lower_prec_expr
                | higher_prec expr
  2. or download this
    lower_prec_expr : higher_prec_expr (lower_prec_op lower_prec_expr)(s?)
                      { [ "put stuff in arrayref" ] }
  3. or download this
    lower_prec_expr : higher_prec_expr (lower_prec_op lower_prec_expr)(s?)
                      { @{$item[2]} ? [ ... ] : $item[1] }
  4. or download this
    lower_prec_expr : higher_prec_expr (lower_prec_op lower_prec_expr)(s)
                      { [ ... ] }
                | higher_prec_expr