T COLOR = "navy"
	  ><TT
	    ><B
	      >(</B
	      ></TT
	    ></FONT
	  ><TT
	  ><I
	    >x1</I
	    ></TT
	  ><FONT COLOR = "blue"
	  ><TT
	    ><I
	      >+</I
	      ></TT
	    ></FONT
	  ><TT
	  ><I
	    >x2</I
	    ></TT
	  ><FONT COLOR = "navy"
	  ><TT
	    ><B
	      >)&nbsp;</B
	      ></TT
	    ></FONT
	  ><TT
	  ><I
	    >max_y</I
	    ></TT
	  ><BR
	  ><TT
	  >&nbsp;&nbsp;&nbsp;&nbsp;</TT
	  ><FONT COLOR = "red"
	  ><TT
	    ><U
	      ><B
		>where</B
		>