The name for Shi-to ryu gets censored because the auto censor programing just sees the 4 letter s word which is a no-no. As for looking for Rohai some shi-to ryu groups do Matsumara rohai and Itosu Shodan, Nidan and Sandan. There is a lot of differences of opinion on wether or not the Itosu Rohai's are versions of Matsumura rohai broken down into three katas the way that Itosu broke down the Naihanchi katas into three separate katas from one.