2"
          rule(factor):	"1 + 2"
            rule(integer):	"1 + 2"
    <span class="preprocessor">push	1</span>
            /rule(integer):	" + 2"
          /rule(factor):	" + 2"
        /rule(term):	" + 2"
        rule(term):	"2"
          rule(factor):	"2"
            rule(integer):	"2"
    <span class="preprocessor">push	2</span>
            /rule(integer):	""
          /rule(factor):	""
        /rule(term):	""
    <span class="preprocessor">popped 1 and 2 from the stack. pushing 3 onto the stack.</sp