Still later, Bridges made further orthographic modifications: w, h, and y became superscripts, and à is read as ya, á as ha, and ā as wa. Superscripts could combine to give hw, hy, etc. Because iu: could now be represented by u: plus y- superscript (ù:), and because the original graphemes for u: and u were easily confused with each other as well as with the now-superscripted w, Bridges began using the now-redundant grapheme for iu: (approximately ų) for u: in his renderings. All of these changes took place in a very short time frame, and have led to substantial confusion on the part of later scholars.