efficient I|F|I|SH|AX|N|T IH|P|IH|SH|AX|N|T I|P|I|SH|AX|N|T IH|F|IH|S|AX|N|T I|F|I|S|AX|N|T IH|P|IH|S|AX|N|T I|P|I|S|AX|N|T