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  1. or download this
    binary_op     : '(' subexpression (op subexpression {[\@item[1..2]]} )
+(s?) ')'
                { [  \$item[2], map { \@\$_ } \@{\$item[3]} ] }
  2. or download this
    binary_op     : '(' subexpression (op subexpression {[@item[1..2]]})(s
+?) ')'
                { [ $item[2], map { @$_ } @{$item[3]} ] }