CAS command question

[compsystems]

I'm sad =(, if the input list contains objects between QUOTES (L9:={ 'x+y=4', 'x+y>4', 'x+y>=4', 'x+y<4', 'x+y<=4' }; ), they should not be rewritten

THE FUNCTION 'QUOTES' IS TO MAINTAIN THE ORIGINAL EXPRESSION, AS WHICH WAS WRITTEN. OTHERWISE 'QUOTES' DOES NOT HAVE UTILITY.

PHP Code:

#cas
    lefty():=
    begin
             print; //print("");
      L8:={};
      L9:={ 'x+y = 4', 'x+y > 4', 'x+y ≥ 4', 'x+y<4', QUOTE(x+y ≤ 4) };
             print(L9); wait();
             //L9:={ x+y = 4, x+y > 4, x+y ≥ 4, x+y<4, x+y ≤ 4 };
      //  Make a list of ->left side<- only for expressions in L9
      for I from 1 to size(L9) do
        L8(I):=left(L9(I));  
      end; 
      return(L8);
      //return [L8, L9];
    end;
#end 


with L9:={ x+y = 4, x+y > 4, x+y ≥ 4, x+y<4, x+y ≤ 4 };
lefty(); => { x+y, x+y, x+y, 4, 4} // ok but no with

L9:={ 'x+y = 4', 'x+y > 4', 'x+y ≥ 4', 'x+y<4', 'x+y ≤ 4' };
lefty(); => { x+y, x+y, x+y, 4, 4} // =(
=> { x+y, x+y, x+y, x+y, x+y}