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my %operations = (  '+' =>  [ 1, 1 ],
                    '-' =>  [ 1, 0 ],
                    '*' =>  [ 2, 1 ],
                    '/' =>  [ 2, 0 ] );

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"2 3 4 * 5 / +"  --> 2 + 3 * 4 / 5
"3 4 * 5 / 2 +"  --> 3 * 4 / 5 + 2
...
"2 3 - 4 -"      --> (2 - 3) - 4
"2 3 4 + -"      --> 2 - (3 + 4)
"2 3 4 - +"      --> 2 + 3 - 4