bsp;a</I
	    ></TT
	  ><BR
	  ><BR
	  ><TT
	  ><I
	    >t1&nbsp;`above`&nbsp;t2&nbsp;</I
	    ></TT
	  ><FONT COLOR = "navy"
	  ><TT
	    ><B
	      >=&nbsp;</B
	      ></TT
	    ></FONT
	  ><TT
	  ><I
	    >trans&nbsp;</I
	    ></TT
	  ><FONT COLOR = "navy"
	  ><TT
	    ><B
	      >(</B
	      ></TT
	    ></FONT
	  ><TT
	  ><I
	    >combine&nbsp;</I
	    ></TT
	  ><FONT COLOR = "navy"
	  ><TT
	    ><B
	      >(</B
	      ></TT
	    ></FONT
	  ><TT
	  ><I
	    >trans&nbs